diff --git a/doc/xschem_man/developer_info.html b/doc/xschem_man/developer_info.html
index d75c05ef..d600ee07 100644
--- a/doc/xschem_man/developer_info.html
+++ b/doc/xschem_man/developer_info.html
@@ -782,6 +782,7 @@ C {verilog_timescale.sym} 1050 -100 0 0 {name=s1 timestep="1ns" precision="1ns"
      <li><kbd> build_date </kbd> time and date this file was built. </li>
      <li><kbd> cadlayers </kbd> number of layers </li>
      <li><kbd> case_insensitive </kbd> case_insensitive symbol matching </li>
+     <li><kbd> change_lw </kbd> change line width when zooming </li>
      <li><kbd> color_ps </kbd> color postscript flag </li>
      <li><kbd> constr_mv </kbd> color postscript flag </li>
      <li><kbd> current_dirname </kbd> directory name of current design </li>
@@ -807,6 +808,7 @@ C {verilog_timescale.sym} 1050 -100 0 0 {name=s1 timestep="1ns" precision="1ns"
      <li><kbd> lastsel </kbd> number of selected objects </li>
      <li><kbd> line_width </kbd> get line width </li>
      <li><kbd> lines </kbd> (xschem get lines n) number of lines on layer 'n' </li>
+     <li><kbd> min_lw </kbd> minimum line width </li>
      <li><kbd> modified </kbd> schematic is in modified state (needs a save) </li>
      <li><kbd> netlist_name </kbd> netlist name if set. If 'fallback' given get default name </li>
      <li><kbd> netlist_type </kbd> get current netlist type (spice/vhdl/verilog/tedax) </li>
@@ -1503,6 +1505,7 @@ C {verilog_timescale.sym} 1050 -100 0 0 {name=s1 timestep="1ns" precision="1ns"
    <ul>
      <li><kbd> cadgrid </kbd> set cad grid (default: 20) </li>
      <li><kbd> cadsnap </kbd> set mouse snap (default: 10) </li>
+     <li><kbd> change_lw </kbd> allow change line width when zooming </li>
      <li><kbd> color_ps </kbd> set color psoscript (1 or 0) </li>
      <li><kbd> crosshair_layer </kbd> set layer for mouse crosshair </li>
      <li><kbd> constr_mv </kbd> set constrained move (1=horiz, 2=vert, 0=none) </li>
diff --git a/src/actions.c b/src/actions.c
index 8bc16de6..3d842954 100644
--- a/src/actions.c
+++ b/src/actions.c
@@ -2896,7 +2896,7 @@ void zoom_full(int dr, int sel, int flags, double shrink)
   double bboxw, bboxh, schw, schh;
   double cs = tclgetdoublevar("cadsnap");
   if(flags & 1) {
-    if(tclgetboolvar("change_lw")) {
+    if(xctx->change_lw) {
       xctx->lw = 1.;
     }
     xctx->areax1 = -2*INT_LINE_W(xctx->lw);
diff --git a/src/callback.c b/src/callback.c
index e12e21bc..ae2869b3 100644
--- a/src/callback.c
+++ b/src/callback.c
@@ -3724,13 +3724,15 @@ static void handle_key_press(int event, KeySym key, int state, int rstate, int m
       break;
 
     case '_':                                         /* toggle change line width */
-      if(!tclgetboolvar("change_lw")) {
+      if(!xctx->change_lw) {
           tcleval("alert_ { enabling change line width} {}");
           tclsetvar("change_lw","1");
+          xctx->change_lw = 1;
       }
       else {
           tcleval("alert_ { disabling change line width} {}");
           tclsetvar("change_lw","0");
+          xctx->change_lw = 0;
       }
       break;
 
diff --git a/src/draw.c b/src/draw.c
index 0928b628..06946d1d 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -1345,7 +1345,7 @@ void drawline(int c, int what, double linex1, double liney1, double linex2, doub
    width = INT_BUS_WIDTH(xctx->lw);
  } else if(bus > 0.0) {
    what = NOW;
-   width = (int) (bus * xctx->mooz);
+   width = XLINEWIDTH(bus * xctx->mooz);
  } else {
    width = XLINEWIDTH(xctx->lw);
  }        
@@ -1424,9 +1424,9 @@ void drawline(int c, int what, double linex1, double liney1, double linex2, doub
    if(dash) {
      dash_arr[0] = dash_arr[1] = (char) dash;
      XSetDashes(display, xctx->gc[c], 0, dash_arr, 1);
-     XSetLineAttributes (display, xctx->gc[c], INT_BUS_WIDTH(xctx->lw), xDashType, xCap, xJoin);
+     XSetLineAttributes (display, xctx->gc[c], width, xDashType, xCap, xJoin);
    } else {
-     XSetLineAttributes (display, xctx->gc[c], INT_BUS_WIDTH(xctx->lw), LineSolid, LINECAP, LINEJOIN);
+     XSetLineAttributes (display, xctx->gc[c], width, LineSolid, LINECAP, LINEJOIN);
    }
    if(xctx->draw_window) XDrawLine(display, xctx->window, xctx->gc[c], (int)x1, (int)y1, (int)x2, (int)y2);
    if(xctx->draw_pixmap) XDrawLine(display, xctx->save_pixmap, xctx->gc[c], (int)x1, (int)y1, (int)x2, (int)y2);
@@ -1748,7 +1748,7 @@ void drawarc(int c, int what, double x, double y, double r, double a, double b,
    width = INT_BUS_WIDTH(xctx->lw);
  } else if(bus > 0.0) {
    what = NOW;
-   width = (int) (bus * xctx->mooz);
+   width = XLINEWIDTH(bus * xctx->mooz);
  } else {
    width = XLINEWIDTH(xctx->lw);
  }
@@ -2103,7 +2103,7 @@ void drawpolygon(int c, int what, double *x, double *y, int points, int poly_fil
   if(bus == -1.0) { 
     width = INT_BUS_WIDTH(xctx->lw);
   } else if(bus > 0.0) {
-    width = (int) (bus * xctx->mooz);
+    width = XLINEWIDTH(bus * xctx->mooz);
   } else {
     width = XLINEWIDTH(xctx->lw);
   }        
@@ -2237,7 +2237,7 @@ void drawrect(int c, int what, double rectx1,double recty1,double rectx2,double
    width = INT_BUS_WIDTH(xctx->lw);
  } else if(bus > 0.0) {
    what = NOW;
-   width = (int) (bus * xctx->mooz);
+   width = XLINEWIDTH(bus * xctx->mooz);
  } else {
    width = XLINEWIDTH(xctx->lw);
  }        
diff --git a/src/editprop.c b/src/editprop.c
index 9c357b54..52b3fb03 100644
--- a/src/editprop.c
+++ b/src/editprop.c
@@ -1048,9 +1048,11 @@ static int edit_rect_property(int x)
                (char *) tclgetvar("tctx::retval"));
       }
       bus = xctx->rect[c][n].bus = get_attr_val(get_tok_value(xctx->rect[c][n].prop_ptr,"bus",0));
-      if(bus > 0.0) width = bus / 2.0;
+
+      if(bus > 0.0) width = XLINEWIDTH(bus) / 2.0;
       else width = INT_BUS_WIDTH(xctx->lw) / 2.0;
-      if(oldbus / 2.0 > width) width = oldbus / 2.0;
+      if(oldbus / 2.0 > width) width = XLINEWIDTH(oldbus) / 2.0;
+
       set_rect_flags(&xctx->rect[c][n]); /* set cached .flags bitmask from attributes */
 
       set_rect_extraptr(0, &xctx->rect[c][n]);
@@ -1144,9 +1146,9 @@ static int edit_line_property(void)
       }
       bus = xctx->line[c][n].bus = get_attr_val(get_tok_value(xctx->line[c][n].prop_ptr,"bus",0));
 
-      if(bus > 0.0) width = bus / 2.0;
+      if(bus > 0.0) width = XLINEWIDTH(bus) / 2.0;
       else width = INT_BUS_WIDTH(xctx->lw) / 2.0;
-      if(oldbus / 2.0 > width) width = oldbus / 2.0;
+      if(oldbus / 2.0 > width) width = XLINEWIDTH(oldbus) / 2.0;
 
       dash = get_tok_value(xctx->line[c][n].prop_ptr,"dash",0);
       if( strcmp(dash, "") ) {
@@ -1209,9 +1211,9 @@ static int edit_wire_property(void)
       }
       xctx->wire[k].bus = bus = get_attr_val(get_tok_value(xctx->wire[k].prop_ptr,"bus",0));
 
-      if(bus > 0.0) width = bus / 2.0;
-      else width = INT_BUS_WIDTH(xctx->lw / 2.0);
-      if(oldbus / 2.0 > width) width = oldbus / 2.0;
+      if(bus > 0.0) width = XLINEWIDTH(bus) / 2.0;
+      else width = INT_BUS_WIDTH(xctx->lw) / 2.0;
+      if(oldbus / 2.0 > width) width = XLINEWIDTH(oldbus) / 2.0;
 
       ov = width > xctx->cadhalfdotsize ? width : xctx->cadhalfdotsize;
       if(xctx->wire[k].y1 < xctx->wire[k].y2) { y1 = xctx->wire[k].y1-ov; y2 = xctx->wire[k].y2+ov; }
@@ -1280,9 +1282,9 @@ static int edit_arc_property(void)
        xctx->arc[c][i].dash = 0;
 
      bus = xctx->arc[c][i].bus = get_attr_val(get_tok_value(xctx->arc[c][i].prop_ptr,"bus",0));
-     if(bus > 0.0) width = bus / 2.0;
+     if(bus > 0.0) width = XLINEWIDTH(bus) / 2.0;
      else width = INT_BUS_WIDTH(xctx->lw) / 2.0;
-     if(oldbus / 2.0 > width) width = oldbus / 2.0;
+     if(oldbus / 2.0 > width) width = XLINEWIDTH(oldbus) / 2.0;
 
      if(oldbus != bus || old_fill != xctx->arc[c][i].fill || old_dash != xctx->arc[c][i].dash) {
        if(!drw) {
@@ -1349,10 +1351,9 @@ static int edit_polygon_property(void)
      bezier = !strboolcmp(get_tok_value(xctx->poly[c][i].prop_ptr,"bezier",0),"true") ;
      xctx->poly[c][i].bus = bus = get_attr_val(get_tok_value(xctx->poly[c][i].prop_ptr,"bus",0));
 
-     if(bus > 0.0) width = bus / 2.0;
-     else width = xctx->cadhalfdotsize > INT_BUS_WIDTH(xctx->lw) / 2.0 ?
-            xctx->cadhalfdotsize : INT_BUS_WIDTH(xctx->lw) / 2.0;
-     if(oldbus / 2.0 > width) width = oldbus / 2.0;
+     if(bus > 0.0) width = XLINEWIDTH(bus) / 2.0;
+     else width = MAJOR(INT_BUS_WIDTH(xctx->lw) / 2.0, xctx->cadhalfdotsize);
+     if(oldbus / 2.0 > width) width = XLINEWIDTH(oldbus) / 2.0;
 
      fill_ptr = get_tok_value(xctx->poly[c][i].prop_ptr,"fill",0);
      if( !strcmp(fill_ptr,"full") )
diff --git a/src/scheduler.c b/src/scheduler.c
index aee402a9..a2ea5d6e 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -1420,6 +1420,10 @@ int xschem(ClientData clientdata, Tcl_Interp *interp, int argc, const char * arg
             if(!xctx) {Tcl_SetResult(interp, not_avail, TCL_STATIC); return TCL_ERROR;}
             Tcl_SetResult(interp, my_itoa(xctx->case_insensitive), TCL_VOLATILE);
           }
+          else if(!strcmp(argv[2], "change_lw")) { /* change line width when zooming */
+            if(xctx->change_lw != 0 ) Tcl_SetResult(interp, "1",TCL_STATIC);
+            else Tcl_SetResult(interp, "0",TCL_STATIC);
+          }
           else if(!strcmp(argv[2], "color_ps")) { /* color postscript flag */
             if(color_ps != 0 ) Tcl_SetResult(interp, "1",TCL_STATIC);
             else Tcl_SetResult(interp, "0",TCL_STATIC);
@@ -1555,6 +1559,10 @@ int xschem(ClientData clientdata, Tcl_Interp *interp, int argc, const char * arg
           }
           break;
           case 'm':
+          if(!strcmp(argv[2], "min_lw")) { /* minimum line width */
+            if(!xctx) {Tcl_SetResult(interp, not_avail, TCL_STATIC); return TCL_ERROR;}
+            Tcl_SetResult(interp, dtoa(xctx->min_lw),TCL_VOLATILE);
+          }
           if(!strcmp(argv[2], "modified")) { /* schematic is in modified state (needs a save) */
             if(!xctx) {Tcl_SetResult(interp, not_avail, TCL_STATIC); return TCL_ERROR;}
             Tcl_SetResult(interp, my_itoa(xctx->modified),TCL_VOLATILE);
@@ -5422,6 +5430,11 @@ int xschem(ClientData clientdata, Tcl_Interp *interp, int argc, const char * arg
             change_linewidth(-1.);
             draw();
           }
+          else if(!strcmp(argv[2], "change_lw")) { /* allow change line width when zooming */
+            if(!xctx) {Tcl_SetResult(interp, not_avail, TCL_STATIC); return TCL_ERROR;}
+            xctx->change_lw = atoi(argv[3]);
+            tclsetboolvar("change_lw", xctx->change_lw);
+          }
           else if(!strcmp(argv[2], "color_ps")) { /* set color psoscript (1 or 0) */
             color_ps=atoi(argv[3]);
           }
diff --git a/src/xinit.c b/src/xinit.c
index b4d26888..e300211a 100644
--- a/src/xinit.c
+++ b/src/xinit.c
@@ -716,6 +716,7 @@ static void alloc_xschem_data(const char *top_path, const char *win_path)
   xctx->x_strcmp = strcmp;
   xctx->fill_pattern = 1;
   xctx->draw_window = 0;
+  xctx->change_lw = 1;
   xctx->do_copy_area = 1;
   xctx->time_last_modify = 0;
 }
@@ -2147,7 +2148,7 @@ void change_linewidth(double w)
   dbg(1, "change_linewidth(): w = %g, win_path=%s lw=%g\n", w, xctx->current_win_path, xctx->lw);
   if(w<0. || xctx->lw == -1.0) {
     double cs = tclgetdoublevar("cadsnap");
-    if(tclgetboolvar("change_lw"))  {
+    if(xctx->change_lw)  {
       xctx->lw=xctx->mooz * 0.09 * cs * (1.0 + MAJOR(xctx->min_lw, 1.0) / 4.0);
       if(xctx->lw > 100.) xctx->lw = 100.;
       xctx->cadhalfdotsize = CADHALFDOTSIZE * (cs < 20. ? cs : 20.) / 10.;
@@ -2404,6 +2405,7 @@ int Tcl_AppInit(Tcl_Interp *inter)
 #endif
  int i;
  double l_width;
+ int change_lw;
  struct stat buf;
  int running_in_src_dir;
  int fs;
@@ -2868,6 +2870,7 @@ int Tcl_AppInit(Tcl_Interp *inter)
    tclsetboolvar("color_ps", color_ps);
  }
  l_width=tclgetdoublevar("line_width");
+ change_lw=tclgetboolvar("change_lw");
  cadlayers=tclgetintvar("cadlayers");
  fix_broken_tiled_fill = tclgetboolvar("fix_broken_tiled_fill");
  fix_mouse_coord = tclgetboolvar("fix_mouse_coord");
@@ -3021,7 +3024,8 @@ int Tcl_AppInit(Tcl_Interp *inter)
     tclsetvar("has_cairo","1");
     #endif
     xctx->min_lw = (int)l_width;
-    if(tclgetboolvar("change_lw")) l_width = -1.0;
+    xctx->change_lw = change_lw;
+    if(xctx->change_lw) l_width = -1.0;
     change_linewidth(l_width);
     dbg(1, "Tcl_AppInit(): done xinit()\n");
     /* Set backing store window attribute */
diff --git a/src/xschem.h b/src/xschem.h
index 65bcd4b9..21233d90 100644
--- a/src/xschem.h
+++ b/src/xschem.h
@@ -429,9 +429,13 @@ do { \
 
 #define SWAP(a,b, tmp) do { tmp = a; a = b; b = tmp; } while(0)
 
-#define XLINEWIDTH(x) MAJOR((tclgetboolvar("change_lw") ? ((int)(x) == 0 ? 1 : (int)(x)) : (int)(x)), xctx->min_lw)
+#define XLINEWIDTH(x) MAJOR((xctx->change_lw ? \
+   ((int)(x) == 0 ? 1 : (int)(x)) : \
+   (int)(x)), xctx->min_lw)
 #define INT_LINE_W(x) MAJOR(((int)(x) == 0 ? 1 : (int)(x)), xctx->min_lw)
-#define INT_BUS_WIDTH(x) ( (int)( (BUS_WIDTH) * (x) ) == 0 ? 1 : (int)( (BUS_WIDTH) * (x) ) ) 
+#define INT_BUS_WIDTH(x) MAJOR((xctx->change_lw ? \
+   ((int)( (BUS_WIDTH) * (x) ) == 0 ? 1 : (int)((BUS_WIDTH) * (x))) : \
+   (int)((BUS_WIDTH) * (x)) ), xctx->min_lw)
 
 /* set do double if you need more precision at the expense of memory */
 #define SPICE_DATA double
@@ -1167,6 +1171,7 @@ typedef struct {
   int fill_pattern;
   int draw_pixmap; /* pixmap used as 2nd buffer */
   int draw_window;  /* MIRRORED IN TCL */
+  int change_lw; /* cached valiue of TCL change_lw */
   int do_copy_area;
   double cadhalfdotsize;
   time_t time_last_modify;
diff --git a/src/xschem.tcl b/src/xschem.tcl
index 0e4f5f53..5f1ebf94 100644
--- a/src/xschem.tcl
+++ b/src/xschem.tcl
@@ -10161,7 +10161,7 @@ proc build_widgets { {topwin {} } } {
          }
 
   $topwin.menubar.view add checkbutton -label "Toggle variable line width" -variable change_lw \
-     -selectcolor $selectcolor -accelerator {_}
+     -selectcolor $selectcolor -accelerator {_} -command "xschem set change_lw $change_lw"
   $topwin.menubar.view add command -label "Set line width" -accelerator {Alt+-} \
        -command {
          input_line "Enter linewidth (float):" "xschem line_width"