diff --git a/Lib/fontTools/misc/bezierTools.py b/Lib/fontTools/misc/bezierTools.py
index 69e182fe1..bf7561de0 100644
--- a/Lib/fontTools/misc/bezierTools.py
+++ b/Lib/fontTools/misc/bezierTools.py
@@ -883,7 +883,7 @@ def _line_t_of_pt(s, e, pt):
         # Line is a point!
         return -1
     # Use the largest
-    if abs(sx - ex) > abs(sy - ex):
+    if abs(sx - ex) > abs(sy - ey):
         return (px - sx) / (ex - sx)
     else:
         return (py - sy) / (ey - sy)