diff --git a/include/d3d8types.h b/include/d3d8types.h
index 95925440b26..35068053b83 100644
--- a/include/d3d8types.h
+++ b/include/d3d8types.h
@@ -38,7 +38,7 @@
 #define D3DCLIPPLANE4 (1 << 4)
 #define D3DCLIPPLANE5 (1 << 5)
 
-#define D3DCOLOR_ARGB(a,r,g,b)        ((D3DCOLOR)((((a)&0xff)<<24)|(((r)&0xff)<<16)|(((g)&0xff)<<8)|((b)&0xff)))
+#define D3DCOLOR_ARGB(a,r,g,b)        ((D3DCOLOR)((((a)&0xffu)<<24)|(((r)&0xffu)<<16)|(((g)&0xffu)<<8)|((b)&0xffu)))
 #define D3DCOLOR_COLORVALUE(r,g,b,a)  D3DCOLOR_RGBA((DWORD)((r)*255.f),(DWORD)((g)*255.f),(DWORD)((b)*255.f),(DWORD)((a)*255.f))
 #define D3DCOLOR_RGBA(r,g,b,a)        D3DCOLOR_ARGB(a,r,g,b)
 #define D3DCOLOR_XRGB(r,g,b)          D3DCOLOR_ARGB(0xff,r,g,b)