diff --git a/tests/ConfigTest.php b/tests/ConfigTest.php
index 6cadc826..0b19365e 100644
--- a/tests/ConfigTest.php
+++ b/tests/ConfigTest.php
@@ -249,7 +249,7 @@ public static function provideInvalidValues()
     {
         return [
             [new \stdClass()],
-            [imagecreate(1, 1)],
+            [curl_init()],
         ];
     }