diff --git a/common/hw-gfx-dp_aux_ch.adb b/common/hw-gfx-dp_aux_ch.adb
index 5b4fde4..20c2c3c 100644
--- a/common/hw-gfx-dp_aux_ch.adb
+++ b/common/hw-gfx-dp_aux_ch.adb
@@ -16,6 +16,7 @@
 with HW.GFX.DP_Defs;
 
 use type HW.Word8;
+use type HW.Word32;
 use type HW.GFX.DP_Defs.Aux_Message_Command;
 
 package body HW.GFX.DP_Aux_Ch is