diff --git a/src/Illuminate/Support/Collection.php b/src/Illuminate/Support/Collection.php
index <HASH>..<HASH> 100755
--- a/src/Illuminate/Support/Collection.php
+++ b/src/Illuminate/Support/Collection.php
@@ -537,7 +537,7 @@ class Collection implements ArrayAccess, Arrayable, Countable, IteratorAggregate
 
 		foreach ($this->items as $key => $item)
 		{
-			if ($value($item, $key)) return $key;
+			if (call_user_func($value, $item, $key)) return $key;
 		}
 
 		return false;
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