diff --git a/common/hw-gfx-gma.ads b/common/hw-gfx-gma.ads
index c8fc398..8285dcb 100644
--- a/common/hw-gfx-gma.ads
+++ b/common/hw-gfx-gma.ads
@@ -62,8 +62,7 @@
    VGA_PLANE_FRAMEBUFFER_OFFSET : constant := 16#ffff_ffff#;
 
    procedure Initialize
-     (MMIO_Base   : in     Word64 := 0;
-      Write_Delay : in     Word64 := 0;
+     (Write_Delay : in     Word64 := 0;
       Clean_State : in     Boolean := False;
       Success     :    out Boolean)
    with