diff --git a/X11-base.yaml b/X11-base.yaml
index 08bc473..c930a29 100644
--- a/X11-base.yaml
+++ b/X11-base.yaml
@@ -127,7 +127,7 @@ data:
             libXtst:
                 rationale: core component of this module.
                 ref: f27
-            Mesa:
+            mesa:
                 rationale: core component of this module.
                 ref: f27
             pango: