diff --git a/data/supported-extensions b/data/supported-extensions
index 62e4c16..0337d06 100644
--- a/data/supported-extensions
+++ b/data/supported-extensions
@@ -10,7 +10,7 @@ decimal 7.0 7.1 7.2 7.3 7.4
 enchant 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0
 exif 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0
 ffi 7.4 8.0
-gd 5.5 5.6 7.0 7.1 7.2 7.3 7.4
+gd 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0
 gettext 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0
 gmagick 5.5 5.6 7.0 7.1 7.2 7.3 7.4
 gmp 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0
diff --git a/scripts/tests/gd.php b/scripts/tests/gd.php
index f7b562b..e9406a0 100644
--- a/scripts/tests/gd.php
+++ b/scripts/tests/gd.php
@@ -55,7 +55,7 @@ try {
         $image2 = $loadFuntion($tempFile);
         unlink($tempFile);
         $tempFile = null;
-        if (!is_resource($image2) || imagesx($image2) !== $imageWidth || imagesy($image2) !== $imageHeight) {
+        if (!(is_resource($image2) || is_object($image2)) || imagesx($image2) !== $imageWidth || imagesy($image2) !== $imageHeight) {
             throw new Exception("{$loadFuntion}() failed");
         }
         imagedestroy($image2);