diff --git a/src/Illuminate/Database/Eloquent/Builder.php b/src/Illuminate/Database/Eloquent/Builder.php
index 87c06c2f96fe..8828d7d510b8 100755
--- a/src/Illuminate/Database/Eloquent/Builder.php
+++ b/src/Illuminate/Database/Eloquent/Builder.php
@@ -1964,7 +1964,7 @@ public function __call($method, $parameters)
             return $this->callNamedScope($method, $parameters);
         }
 
-        if (in_array(strtolower($method), $this->passthru)) {
+        if (in_array(strtolower($method), array_map('strtolower', $this->passthru))) {
             return $this->toBase()->{$method}(...$parameters);
         }