diff --git a/lodash.src.js b/lodash.src.js
index e43613f62..c22ae7678 100644
--- a/lodash.src.js
+++ b/lodash.src.js
@@ -803,12 +803,19 @@
       //
       // Use `Object.preventExtensions` on a plain object instead of simply using
       // `Object('x')` because Chrome and IE fail to throw an error when attempting
-      // to assign values to readonly indexes of strings in strict mode.
-      var object = { '1': 0 },
-          func = preventExtensions && isNative(func = Object.assign) && func;
-
-      try { func(preventExtensions(object), 'xo'); } catch(e) {}
-      return !object[1] && func;
+      // to assign values to readonly indexes of strings.
+      var func = preventExtensions && isNative(func = Object.assign) && func;
+      try {
+        if (func) {
+          var object = preventExtensions({ '1': 0 });
+          object[0] = 1;
+        }
+      } catch(e) {
+        // Only attempt in strict mode.
+        try { func(object, 'xo'); } catch(e) {}
+        return !object[1] && func;
+      }
+      return false;
     }());
 
     /* Native method references for those with the same name as other `lodash` methods. */