diff --git a/lib/stroke_extractor.js b/lib/stroke_extractor.js
index dfe97848..55f29f2d 100644
--- a/lib/stroke_extractor.js
+++ b/lib/stroke_extractor.js
@@ -180,7 +180,6 @@ function get_features(ins, out) {
 // connecting two corners by a bridge. This classifier throws out most data.
 function hand_tuned_classifier(features) {
   if (features[6] > 0) {
-    assert(features[4] === features[5]);
     return -Angle.penalty(features[4]);
   }
   var angle_penalty = Angle.penalty(features[0]) + Angle.penalty(features[1]);