diff --git a/bikeshed/spec-data/readonly/link-defaults.infotree b/bikeshed/spec-data/readonly/link-defaults.infotree
index 9feab7192a..95fe460567 100644
--- a/bikeshed/spec-data/readonly/link-defaults.infotree
+++ b/bikeshed/spec-data/readonly/link-defaults.infotree
@@ -79,6 +79,7 @@ info: ignored-specs
 	spec: css-2d-transforms-1
 	spec: css-3d-transforms-1
 	spec: css-backgrounds-4
+	spec: css-gcpm-3
 	spec: css-page-4
 	spec: css-snappoints-1
 	spec: css-template-1