diff --git a/ext/gd/tests/createfromstring.phpt b/ext/gd/tests/createfromstring.phpt
index 573195fe7c0..cf7d1952fb1 100644
--- a/ext/gd/tests/createfromstring.phpt
+++ b/ext/gd/tests/createfromstring.phpt
@@ -3,6 +3,7 @@ imagecreatefromstring
 --SKIPIF--
 <?php
         if (!function_exists('imagecreatefromstring')) die("skip gd extension not available\n");
+		if (!function_exists('imagepng')) die("skip no imagpng()\n");
 ?>
 --FILE--
 <?php