diff --git a/common/haswell/hw-gfx-gma-power_and_clocks_haswell.ads b/common/haswell/hw-gfx-gma-power_and_clocks_haswell.ads
index 2665122..488b90c 100644
--- a/common/haswell/hw-gfx-gma-power_and_clocks_haswell.ads
+++ b/common/haswell/hw-gfx-gma-power_and_clocks_haswell.ads
@@ -17,7 +17,7 @@
 private package HW.GFX.GMA.Power_And_Clocks_Haswell is
 
    procedure Pre_All_Off;
-   procedure Post_All_Off is null;
+   procedure Post_All_Off;
 
    procedure Initialize;