diff --git a/ext/gd/tests/bug77270.phpt b/ext/gd/tests/bug77270.phpt
index 1c4555a64d7..2250fefd206 100644
--- a/ext/gd/tests/bug77270.phpt
+++ b/ext/gd/tests/bug77270.phpt
@@ -1,5 +1,7 @@
 --TEST--
 Bug #77270 (imagecolormatch Out Of Bounds Write on Heap)
+--INI--
+memory_limit=-1
 --SKIPIF--
 <?php
 if (!extension_loaded('gd')) die('skip gd extension not available');