diff --git a/core/modules/system/src/Tests/Image/ToolkitGdTest.php b/core/modules/system/src/Tests/Image/ToolkitGdTest.php
index 5ea777f..a731f5b 100644
--- a/core/modules/system/src/Tests/Image/ToolkitGdTest.php
+++ b/core/modules/system/src/Tests/Image/ToolkitGdTest.php
@@ -466,7 +466,7 @@ function testGifTransparentImages() {
     $resource = $image->getToolkit()->getResource();
     $color_index = imagecolorat($resource, $image->getWidth() - 1, 0);
     $color = array_values(imagecolorsforindex($resource, $color_index));
-    $this->assertEqual($this->whiteTransparent, $color, "New GIF image with no transparent color set after creation has full transparent color at corner 1.");
+    $this->assertEqual($this->rotateTransparent, $color, "New GIF image with no transparent color set after creation has full transparent color at corner 1.");
     // Save image.
     $this->assertTrue($image->save($file_path), "New GIF image {$file} was saved.");
     // Reload image.