diff --git a/src/callback.c b/src/callback.c
index 54d7ff0b..1853799d 100644
--- a/src/callback.c
+++ b/src/callback.c
@@ -219,6 +219,7 @@ static void start_line(double mx, double my)
       if(xctx->constr_mv == 1) my = xctx->my_double_save;
       if(xctx->constr_mv == 2) mx = xctx->mx_double_save;
     } else {
+      xctx->manhattan_lines = 0;
       xctx->mx_double_save=mx;
       xctx->my_double_save=my;
     }
@@ -245,6 +246,7 @@ static void start_wire(double mx, double my)
     if(xctx->constr_mv == 1) my = xctx->my_double_save;
     if(xctx->constr_mv == 2) mx = xctx->mx_double_save;
   } else {
+    xctx->manhattan_lines = 1;
     xctx->mx_double_save=mx;
     xctx->my_double_save=my;
   }