diff --git a/common/hw-gfx-gma-pipe_setup.ads b/common/hw-gfx-gma-pipe_setup.ads
index a61ff00..fe877ad 100644
--- a/common/hw-gfx-gma-pipe_setup.ads
+++ b/common/hw-gfx-gma-pipe_setup.ads
@@ -57,6 +57,8 @@
       FB       : Framebuffer_Type;
       Cursor   : Cursor_Type);
 
+   procedure Scaler_Available (Available : out Boolean; Pipe : Pipe_Index);
+
 private
 
    subtype WM_Levels is Natural range 0 .. 7;