diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 942242a41..3f1a25032 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -950,18 +950,13 @@
         isPartial = bitmask & PARTIAL_FLAG,
         isPartialRight = bitmask & PARTIAL_RIGHT_FLAG;
 
-    if (!isBindKey && !isFunction(func)) {
+    if (!isFunction(func)) {
       throw new TypeError;
     }
     if (isPartial && !partialArgs.length) {
       bitmask &= ~PARTIAL_FLAG;
       isPartial = partialArgs = false;
     }
-    if (arity == null) {
-      arity = isBindKey ? 0 : func.length;
-    } else if (arity < 0) {
-      arity = 0;
-    }
     if (isPartial) {
       partialHolders = getHolders(partialArgs);
     }
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index 94b51373b..aa8ed2220 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -3,37 +3,37 @@
  * Lo-Dash 2.4.1 (Custom Build) lodash.com/license | Underscore.js 1.6.0 underscorejs.org/LICENSE
  * Build: `lodash underscore -o ./dist/lodash.underscore.js`
  */
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