diff --git a/SketchWidget.py b/SketchWidget.py
index d964798..8807aa4 100644
--- a/SketchWidget.py
+++ b/SketchWidget.py
@@ -30,7 +30,7 @@ class SketchWidget:
         self.axis_color = (1.0, 0.0, 0.0, 1.0)
         self.constraint_color = (0.8, 1.0, 0.0, 1.0)
         self.snap_angle = 10
-        self.snap_dist = 10
+        self.hv_snap_dist = 10
 
         try:
             # try double-buffered
@@ -373,16 +373,16 @@ class SketchWidget:
         angle *= 180.0 / math.pi
         def within(a, b, d): return abs(a - b) < d
         def snaps_to(q): return within(angle, q, self.snap_angle)
-        snap_dist = self.screenDistToDist(self.snap_dist)
+        hv_snap_dist = self.screenDistToDist(self.hv_snap_dist)
         if ((snaps_to(-180) or snaps_to(180) or snaps_to(0))
-                and within(start[1], this_pt[1], snap_dist)):
+                and within(start[1], this_pt[1], hv_snap_dist)):
             this_pt = (this_pt[0], start[1])
             if not (len(self.drawingConstraints) > 0
                     and isinstance(self.drawingConstraints[0], Horizontal)):
                 c = Horizontal(self.drawingShape, 0, self.drawingShape, 1)
                 self.drawingConstraints = [c]
         elif ((snaps_to(-90) or snaps_to(90))
-                and within(start[0], this_pt[0], snap_dist)):
+                and within(start[0], this_pt[0], hv_snap_dist)):
             this_pt = (start[0], this_pt[1])
             if not (len(self.drawingConstraints) > 0
                     and isinstance(self.drawingConstraints[0], Vertical)):