diff --git a/sdk/lib/_internal/lib/js_number.dart b/sdk/lib/_internal/lib/js_number.dart
index de6986e8d86..1e3955c89a3 100644
--- a/sdk/lib/_internal/lib/js_number.dart
+++ b/sdk/lib/_internal/lib/js_number.dart
@@ -58,8 +58,14 @@ class JSNumber extends Interceptor implements num {
   }
 
   num abs() => JS('num', r'Math.abs(#)', this);
+  
+  static const int _MIN_INT32 = -0x80000000;
+  static const int _MAX_INT32 = 0x7FFFFFFF;
 
   int toInt() {
+    if (this >= _MIN_INT32 && this <= _MAX_INT32) {
+      return JS('int', '# | 0', this);
+    }
     if (JS('bool', r'isFinite(#)', this)) {
       return JS('int', r'# + 0', truncateToDouble());  // Converts -0.0 to +0.0.
     }
diff --git a/tests/corelib/toInt_test.dart b/tests/corelib/toInt_test.dart
new file mode 100644
index 00000000000..7a69691db7b
--- /dev/null
+++ b/tests/corelib/toInt_test.dart
@@ -0,0 +1,20 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "package:expect/expect.dart";
+
+main() {
+  Expect.equals(-0x80000001, (-0x80000001).toInt()); 
+  Expect.equals(-0x80000000, (-0x80000000 - 0.7).toInt()); 
+  Expect.equals(-0x80000000, (-0x80000000 - 0.3).toInt()); 
+  Expect.equals(-0x7FFFFFFF, (-0x80000000 + 0.3).toInt()); 
+  Expect.equals(-0x7FFFFFFF, (-0x80000000 + 0.7).toInt()); 
+  Expect.equals(-0x7FFFFFFF, (-0x7FFFFFFF).toInt()); 
+  Expect.equals(0x7FFFFFFE, (0x7FFFFFFE).toInt()); 
+  Expect.equals(0x7FFFFFFE, (0x7FFFFFFF - 0.7).toInt()); 
+  Expect.equals(0x7FFFFFFE, (0x7FFFFFFF - 0.3).toInt()); 
+  Expect.equals(0x7FFFFFFF, (0x7FFFFFFF + 0.3).toInt()); 
+  Expect.equals(0x7FFFFFFF, (0x7FFFFFFF + 0.7).toInt()); 
+  Expect.equals(0x80000000, 0x80000000.toInt()); 
+}