diff --git a/common/haswell_shared/hw-gfx-gma-connectors-ddi.adb b/common/haswell_shared/hw-gfx-gma-connectors-ddi.adb
index 7f179ff..7efb93f 100644
--- a/common/haswell_shared/hw-gfx-gma-connectors-ddi.adb
+++ b/common/haswell_shared/hw-gfx-gma-connectors-ddi.adb
@@ -298,7 +298,7 @@
 
    procedure Initialize
    is
-      Iboost_Value : constant Word32 := 1;
+      Iboost_Value : constant Word32 := Word32 (Config.DDI_Buffer_Iboost);
    begin
       if Config.Has_DDI_Buffer_Trans then
          declare