diff --git a/SketchWidget.py b/SketchWidget.py
index 9d9797d..fe3e74b 100644
--- a/SketchWidget.py
+++ b/SketchWidget.py
@@ -143,7 +143,7 @@ class SketchWidget:
                     + self.view_center[1])
 
     def screenDistToDist(self, dist):
-        return dist * self.size[0] / self.view_width
+        return dist / self.size[0] * self.view_width
 
     def drawLine(self, shape):
         glColor(*self.line_color)