diff --git a/tests/rustdoc-gui/scrape-examples-color.goml b/tests/rustdoc-gui/scrape-examples-color.goml
index 8ddb06fccfc..b6991b912b5 100644
--- a/tests/rustdoc-gui/scrape-examples-color.goml
+++ b/tests/rustdoc-gui/scrape-examples-color.goml
@@ -81,16 +81,16 @@ define-function: (
 
 call-function: ("check-background", {
     "theme": "ayu",
-    "background_color_start": "rgb(15, 20, 25)",
+    "background_color_start": "rgba(15, 20, 25, 1)",
     "background_color_end": "rgba(15, 20, 25, 0)",
 })
 call-function: ("check-background", {
     "theme": "dark",
-    "background_color_start": "rgb(53, 53, 53)",
+    "background_color_start": "rgba(53, 53, 53, 1)",
     "background_color_end": "rgba(53, 53, 53, 0)",
 })
 call-function: ("check-background", {
     "theme": "light",
-    "background_color_start": "rgb(255, 255, 255)",
+    "background_color_start": "rgba(255, 255, 255, 1)",
     "background_color_end": "rgba(255, 255, 255, 0)",
 })