diff --git a/common/hw-gfx-gma.ads b/common/hw-gfx-gma.ads
index afd1512..1282e89 100644
--- a/common/hw-gfx-gma.ads
+++ b/common/hw-gfx-gma.ads
@@ -19,6 +19,8 @@
 with HW.Port_IO;
 with HW.GFX.Framebuffer_Filler;
 
+use type HW.Word32;
+
 package HW.GFX.GMA
 with
    Abstract_State =>