diff --git a/OSL Programs/apps/System/Activity.osl b/OSL Programs/apps/System/Activity.osl
index 04debc59..19b0f5b2 100644
--- a/OSL Programs/apps/System/Activity.osl	
+++ b/OSL Programs/apps/System/Activity.osl	
@@ -34,6 +34,7 @@ prim = user.theme.primary
 seco = user.theme.secondary
 tert = user.theme.tertiary
 txtc = user.theme.text
+window_colour = user.theme.background
 
 mainloop:
 loc -2 2 -20 -20