diff --git a/pkg/dev_compiler/lib/runtime/dart_runtime.js b/pkg/dev_compiler/lib/runtime/dart_runtime.js
index edf206396c3c..3cb2c617ca74 100644
--- a/pkg/dev_compiler/lib/runtime/dart_runtime.js
+++ b/pkg/dev_compiler/lib/runtime/dart_runtime.js
@@ -423,7 +423,7 @@ var dart, dartx;
   function equals(x, y) {
     if (x == null || y == null) return x == y;
     let eq = x['=='];
-    return eq ? eq.call(x, y) : x == y;
+    return eq ? eq.call(x, y) : x === y;
   }
   dart.equals = equals;