diff --git a/drc/DRCbasic.c b/drc/DRCbasic.c
index 97448766..7ceca8d2 100644
--- a/drc/DRCbasic.c
+++ b/drc/DRCbasic.c
@@ -281,7 +281,7 @@ areaCheck(tile, arg)
  * Side effects:
  *	Calls function for each design-rule violation in celldef
  *	that is triggered by an edge in rect and whose violation
- *	area falls withing clipRect.  This routine makes a flat check:
+ *	area falls within clipRect.  This routine makes a flat check:
  *	it considers only information in the paint planes of celldef,
  *	and does not expand children.  Function should have the form:
  *	void
diff --git a/drc/DRCcontin.c b/drc/DRCcontin.c
index 6365db7a..000050a7 100644
--- a/drc/DRCcontin.c
+++ b/drc/DRCcontin.c
@@ -481,7 +481,7 @@ DRCContinuous()
 				 */
 	while ((DRCPendingRoot != (DRCPendingCookie *)NULL) &&
 	    DBSrPaintArea ((Tile *) NULL,
-	    DRCPendingRoot->dpc_def->cd_planes [PL_DRC_CHECK],
+	    DRCPendingRoot->dpc_def->cd_planes[PL_DRC_CHECK],
 	    &TiPlaneRect, &DBAllButSpaceBits, drcCheckTile, (ClientData) NULL))
 	{
 			     /* check for new user command (without blocking) */
@@ -664,7 +664,7 @@ drcCheckTile(tile, arg)
      */
 
     /* DRCBasicCheck (celldef, &checkbox, &erasebox, drcPaintError,
-	(ClientData) drcTempPlane); */
+		(ClientData) drcTempPlane); */
 
     /* Check #2:  check interactions between paint and subcells, and
      * also between subcells and other subcells.  If any part of a
@@ -675,8 +675,8 @@ drcCheckTile(tile, arg)
      */
 
     DRCErrorType = TT_ERROR_S;
-    (void) DRCInteractionCheck(celldef, &square, &erasebox,
-		drcPaintError, (ClientData) drcTempPlane);
+    (void) DRCInteractionCheck(celldef, &erasebox, drcPaintError,
+		(ClientData) drcTempPlane);
     
     /* Check #3:  check for array formation errors in the area. */
 
diff --git a/drc/DRCmain.c b/drc/DRCmain.c
index a9c879f0..ed119de7 100644
--- a/drc/DRCmain.c
+++ b/drc/DRCmain.c
@@ -530,7 +530,7 @@ drcWhyFunc(scx, cdarg)
 
     /* Check paint and interactions in this subcell. */
     
-    (void) DRCInteractionCheck(def, &scx->scx_area, &scx->scx_area,
+    (void) DRCInteractionCheck(def, &scx->scx_area,
 		(dolist) ? drcListError : drcPrintError,
 		(ClientData) scx);
     (void) DRCArrayCheck(def, &scx->scx_area,
@@ -554,7 +554,7 @@ drcWhyAllFunc(scx, cdarg)
 
     /* Check paint and interactions in this subcell. */
     
-    (void) DRCInteractionCheck(def, &scx->scx_area, &scx->scx_area,
+    (void) DRCInteractionCheck(def, &scx->scx_area,
 		drcListallError, (ClientData)scx);
     (void) DRCArrayCheck(def, &scx->scx_area,
 		drcListallError, (ClientData)scx);
diff --git a/drc/DRCsubcell.c b/drc/DRCsubcell.c
index f7f8c159..561845ad 100644
--- a/drc/DRCsubcell.c
+++ b/drc/DRCsubcell.c
@@ -573,9 +573,8 @@ drcExactOverlapTile(tile, cxp)
  */
 
 int
-DRCInteractionCheck(def, area, erasebox, func, cdarg)
+DRCInteractionCheck(def, erasebox, func, cdarg)
     CellDef *def;		/* Definition in which to do check. */
-    Rect *area;			/* Area in which all errors are to be found. */
     Rect *erasebox;		/* Smaller area containing DRC check tiles */
     void (*func)();		/* Function to call for each error. */
     ClientData cdarg;		/* Extra info to be passed to func. */
@@ -596,25 +595,25 @@ DRCInteractionCheck(def, area, erasebox, func, cdarg)
      * square separately.
      */
     
-    x = (area->r_xbot/DRCStepSize) * DRCStepSize;
-    if (x > area->r_xbot) x -= DRCStepSize;
-    y = (area->r_ybot/DRCStepSize) * DRCStepSize;
-    if (y > area->r_ybot) y -= DRCStepSize;
-    for (square.r_xbot = x; square.r_xbot < area->r_xtop;
+    x = (erasebox->r_xbot/DRCStepSize) * DRCStepSize;
+    if (x > erasebox->r_xbot) x -= DRCStepSize;
+    y = (erasebox->r_ybot/DRCStepSize) * DRCStepSize;
+    if (y > erasebox->r_ybot) y -= DRCStepSize;
+    for (square.r_xbot = x; square.r_xbot < erasebox->r_xtop;
 	 square.r_xbot += DRCStepSize)
-	for (square.r_ybot = y; square.r_ybot < area->r_ytop;
+	for (square.r_ybot = y; square.r_ybot < erasebox->r_ytop;
 	     square.r_ybot += DRCStepSize)
 	{
 	    square.r_xtop = square.r_xbot + DRCStepSize;
 	    square.r_ytop = square.r_ybot + DRCStepSize;
 
-	    /* Limit square to area.  Otherwise, a huge processing	*/
+	    /* Limit square to erasebox.  Otherwise, a huge processing	*/
 	    /* penalty is incurred for finding a single error (e.g.,	*/
 	    /* using "drc find" or "drc why" in a large design with a	*/
 	    /* large step size.						*/
 
             cliparea = square;
-	    GeoClip(&cliparea, area);
+	    GeoClip(&cliparea, erasebox);
 
 	    /* Find all the interactions in the square, and clip to the error
 	     * area we're interested in. */
diff --git a/drc/DRCtech.c b/drc/DRCtech.c
index 034ff029..38798c54 100644
--- a/drc/DRCtech.c
+++ b/drc/DRCtech.c
@@ -3384,6 +3384,10 @@ drcTechFinalStyle(style)
     drcScaleUp(style, style->DRCScaleFactorD);
     drcScaleDown(style, style->DRCScaleFactorN);
 
+    /* Scale DRCTechHalo to match */
+    DRCTechHalo *= style->DRCScaleFactorD;
+    DRCTechHalo /= style->DRCScaleFactorN;
+
     /* Set maximum halo */
     style->DRCTechHalo = DRCTechHalo;