diff --git a/ext/gd/tests/gh19666.phpt b/ext/gd/tests/gh19666.phpt
index 2d82b9b44760..b1409946aa0a 100644
--- a/ext/gd/tests/gh19666.phpt
+++ b/ext/gd/tests/gh19666.phpt
@@ -2,6 +2,10 @@
 GH-19666 (Unexpected nan value in imageconvolution)
 --EXTENSIONS--
 gd
+--SKIPIF--
+<?php
+    if (!GD_BUNDLED) die("skip requires bundled GD library\n");
+?>
 --FILE--
 <?php
 $image = imagecreatetruecolor(180, 30);
diff --git a/ext/gd/tests/gh19739.phpt b/ext/gd/tests/gh19739.phpt
index 7dce387b780e..7ef73aeab67d 100644
--- a/ext/gd/tests/gh19739.phpt
+++ b/ext/gd/tests/gh19739.phpt
@@ -2,6 +2,10 @@
 GH-19739 (integer overflow in imageellipse / imagefilledellipse)
 --EXTENSIONS--
 gd
+--SKIPIF--
+<?php
+    if (!GD_BUNDLED) die("skip requires bundled GD library\n");
+?>
 --FILE--
 <?php
 $im = imagecreatetruecolor(400, 300);