diff --git a/common/broxton/hw-gfx-gma-ddi_phy.ads b/common/broxton/hw-gfx-gma-ddi_phy.ads
index 98d0594..fc6cacf 100644
--- a/common/broxton/hw-gfx-gma-ddi_phy.ads
+++ b/common/broxton/hw-gfx-gma-ddi_phy.ads
@@ -38,7 +38,7 @@
      (Port        : Digital_Port;
       Train_Set   : DP_Info.Train_Set);
 
-   type HDMI_Buf_Trans_Range is range 0 .. 9;
+   subtype HDMI_Buf_Trans_Range is DDI_HDMI_Buf_Trans_Range range 0 .. 9;
    procedure Set_HDMI_Signal_Levels
      (Port  : DDI_Phy_Port;
       Level : HDMI_Buf_Trans_Range);