diff --git a/headers/os/interface/Window.h b/headers/os/interface/Window.h
index a20f3e13a2..4a9d51bc01 100644
--- a/headers/os/interface/Window.h
+++ b/headers/os/interface/Window.h
@@ -79,7 +79,8 @@ enum {
 	B_NO_WORKSPACE_ACTIVATION	= 0x00000100,
 	B_NOT_ANCHORED_ON_ACTIVATE	= 0x00020000,
 	B_ASYNCHRONOUS_CONTROLS		= 0x00080000,
-	B_QUIT_ON_WINDOW_CLOSE		= 0x00100000
+	B_QUIT_ON_WINDOW_CLOSE		= 0x00100000,
+	B_SAME_POSITION_IN_ALL_WORKSPACES = 0x00200000,
 };
 
 #define B_CURRENT_WORKSPACE	0