diff --git a/src/runtime.cc b/src/runtime.cc
index a871538dc8..557bfb07ae 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -6312,7 +6312,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StringParseInt) {
   SealHandleScope shs(isolate);
 
   CONVERT_ARG_CHECKED(String, s, 0);
-  CONVERT_SMI_ARG_CHECKED(radix, 1);
+  CONVERT_NUMBER_CHECKED(int, radix, Int32, args[1]);
 
   s->TryFlatten();
 
diff --git a/test/mjsunit/regress/regress-parseint.js b/test/mjsunit/regress/regress-parseint.js
new file mode 100644
index 0000000000..05501f31fd
--- /dev/null
+++ b/test/mjsunit/regress/regress-parseint.js
@@ -0,0 +1,18 @@
+// Copyright 2014 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
+
+function f(string, radix) {
+  // Use a phi to force radix into heap number representation.
+  radix = (radix == 0) ? radix : (radix >> 0);
+  if (radix != 2) return NaN;
+  return %StringParseInt(string, radix);
+}
+
+assertEquals(2, (-4294967294) >> 0);
+assertEquals(3, f("11", -4294967294));
+assertEquals(NaN, f("11", -2147483650));
+%OptimizeFunctionOnNextCall(f);
+assertEquals(3, f("11", -4294967294));