diff --git a/tiddlywiki5/shadows/tiddlycss/BaseColour.tid b/tiddlywiki5/shadows/tiddlycss/BaseColour.tid
index e5bf58b96..626bcf98d 100644
--- a/tiddlywiki5/shadows/tiddlycss/BaseColour.tid
+++ b/tiddlywiki5/shadows/tiddlycss/BaseColour.tid
@@ -1,4 +1,4 @@
 title: BaseColour
-type: text/plain
+type: text/x-tiddlywiki-css
 
 #ffe8d8
\ No newline at end of file