diff --git a/rtdata/themes/RawTherapee-GTK3-20_.css b/rtdata/themes/RawTherapee-GTK3-20_.css
index d8f51d962..19bd6ac9c 100644
--- a/rtdata/themes/RawTherapee-GTK3-20_.css
+++ b/rtdata/themes/RawTherapee-GTK3-20_.css
@@ -836,5 +836,5 @@ paned.vertical > separator {
 }
 
 #PartialPasteHeaderSep {
-    color: #D8D8D8;
+    background-color: #D8D8D8;
 }