diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 0b189d5e3f..986f4ee16e 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -6714,7 +6714,7 @@ HValue* HOptimizedGraphBuilder::HandleKeyedElementAccess(
 
   if (monomorphic) {
     Handle<Map> map = types->first();
-    if (map->has_slow_elements_kind()) {
+    if (map->has_slow_elements_kind() || !map->IsJSObjectMap()) {
       instr = is_store ? BuildStoreKeyedGeneric(obj, key, val)
                        : BuildLoadKeyedGeneric(obj, key);
       AddInstruction(instr);
diff --git a/test/mjsunit/regress/regress-keyed-access-string-length.js b/test/mjsunit/regress/regress-keyed-access-string-length.js
new file mode 100644
index 0000000000..f2ead686c6
--- /dev/null
+++ b/test/mjsunit/regress/regress-keyed-access-string-length.js
@@ -0,0 +1,37 @@
+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax
+
+function f(i) {
+  return "abc"[i];
+}
+
+f("length");
+f("length");
+%OptimizeFunctionOnNextCall(f);
+f("length");