diff --git a/lodash.js b/lodash.js
index cb5e0d41b..8c0295e3f 100644
--- a/lodash.js
+++ b/lodash.js
@@ -4165,7 +4165,8 @@
             argsLength = arguments.length,
             leftIndex = -1,
             leftLength = partials.length,
-            args = Array(leftLength + argsLength);
+            args = Array(leftLength + argsLength),
+            fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
 
         while (++leftIndex < leftLength) {
           args[leftIndex] = partials[leftIndex];
@@ -4173,7 +4174,6 @@
         while (argsLength--) {
           args[leftIndex++] = arguments[++argsIndex];
         }
-        var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
         return apply(fn, isBind ? thisArg : this, args);
       }
       return wrapper;