--- a/js/src/jsstr.cpp
+++ b/js/src/jsstr.cpp
@@ -2644,20 +2644,23 @@ js::str_split(JSContext *cx, unsigned ar
         return true;
     }
     RootedVar<JSLinearString*> strlin(cx, str->ensureLinear(cx));
     if (!strlin)
         return false;
 
     /* Steps 11-15. */
     JSObject *aobj;
-    if (!re.initialized())
-        aobj = SplitHelper(cx, strlin, limit, SplitStringMatcher(cx, sepstr), type);
-    else
-        aobj = SplitHelper(cx, strlin, limit, SplitRegExpMatcher(*re, cx->regExpStatics()), type);
+    if (!re.initialized()) {
+        SplitStringMatcher matcher(cx, sepstr);
+        aobj = SplitHelper(cx, strlin, limit, matcher, type);
+    } else {
+        SplitRegExpMatcher matcher(*re, cx->regExpStatics());
+        aobj = SplitHelper(cx, strlin, limit, matcher, type);
+    }
     if (!aobj)
         return false;
 
     /* Step 16. */
     aobj->setType(type);
     args.rval() = ObjectValue(*aobj);
     return true;
 }