diff --git a/test/mjsunit/regress/regress-4320.js b/test/mjsunit/regress/regress-4320.js
new file mode 100644
index 0000000..df6a99b
--- /dev/null
+++ b/test/mjsunit/regress/regress-4320.js
@@ -0,0 +1,21 @@
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --expose-debug-as debug
+
+var Debug = debug.Debug;
+
+function f() { g(); }
+
+function g() { }
+
+f();
+f();
+%OptimizeFunctionOnNextCall(f);
+f();
+
+Debug.setListener(function() {});
+Debug.setBreakPoint(g, 0);
+
+f();