diff --git a/src/path/Curve.js b/src/path/Curve.js
index 90977dfe..aed9b659 100644
--- a/src/path/Curve.js
+++ b/src/path/Curve.js
@@ -670,7 +670,7 @@ statics: {
             h1 = new Point(v[2] - p1x, v[3] - p1y),
             h2 = new Point(v[4] - p2x, v[5] - p2y);
         return l.isZero() ? h1.isZero() && h2.isZero()
-                : l.isCollinear(h2) && l.isCollinear(h2);
+                : l.isCollinear(h1) && l.isCollinear(h2);
     },
 
     isFlatEnough: function(v, tolerance) {
diff --git a/src/path/Segment.js b/src/path/Segment.js
index 21b16871..cb56c7a8 100644
--- a/src/path/Segment.js
+++ b/src/path/Segment.js
@@ -575,7 +575,7 @@ var Segment = Base.extend(/** @lends Segment# */{
                 h1 = seg1._handleOut,
                 h2 = seg2._handleIn;
             return l.isZero() ? h1.isZero() && h2.isZero()
-                    : l.isCollinear(h2) && l.isCollinear(h2);
+                    : l.isCollinear(h1) && l.isCollinear(h2);
         },
 
         isCollinear: function(seg1, seg2, seg3, seg4) {