diff --git a/miniwin/include/miniwin/ddraw.h b/miniwin/include/miniwin/ddraw.h
index 37dfb9d1..7b403259 100644
--- a/miniwin/include/miniwin/ddraw.h
+++ b/miniwin/include/miniwin/ddraw.h
@@ -13,14 +13,14 @@
 #define DDERR_CANNOTDETACHSURFACE MAKE_DDHRESULT(20)
 #define DDERR_CURRENTLYNOTAVAIL MAKE_DDHRESULT(40)
 #define DDERR_EXCEPTION MAKE_DDHRESULT(55)
-#define DDERR_GENERIC 0x80004005
+#define DDERR_GENERIC ((HRESULT) 0x80004005)
 #define DDERR_HEIGHTALIGN MAKE_DDHRESULT(90)
 #define DDERR_INCOMPATIBLEPRIMARY MAKE_DDHRESULT(95)
 #define DDERR_INVALIDCAPS MAKE_DDHRESULT(100)
 #define DDERR_INVALIDCLIPLIST MAKE_DDHRESULT(110)
 #define DDERR_INVALIDMODE MAKE_DDHRESULT(120)
 #define DDERR_INVALIDOBJECT MAKE_DDHRESULT(130)
-#define DDERR_INVALIDPARAMS 0x80070057
+#define DDERR_INVALIDPARAMS ((HRESULT) 0x80070057)
 #define DDERR_INVALIDPIXELFORMAT MAKE_DDHRESULT(145)
 #define DDERR_INVALIDRECT MAKE_DDHRESULT(150)
 #define DDERR_LOCKEDSURFACES MAKE_DDHRESULT(160)
@@ -48,7 +48,7 @@
 #define DDERR_NOZBUFFERHW MAKE_DDHRESULT(340)
 #define DDERR_NOZOVERLAYHW MAKE_DDHRESULT(350)
 #define DDERR_OUTOFCAPS MAKE_DDHRESULT(360)
-#define DDERR_OUTOFMEMORY 0x8007000E
+#define DDERR_OUTOFMEMORY ((HRESULT) 0x8007000E)
 #define DDERR_OUTOFVIDEOMEMORY MAKE_DDHRESULT(380)
 #define DDERR_OVERLAYCANTCLIP MAKE_DDHRESULT(382)
 #define DDERR_OVERLAYCOLORKEYONLYONEACTIVE MAKE_DDHRESULT(384)
@@ -63,7 +63,7 @@
 #define DDERR_TOOBIGHEIGHT MAKE_DDHRESULT(470)
 #define DDERR_TOOBIGSIZE MAKE_DDHRESULT(480)
 #define DDERR_TOOBIGWIDTH MAKE_DDHRESULT(490)
-#define DDERR_UNSUPPORTED 0x80004001
+#define DDERR_UNSUPPORTED ((HRESULT) 0x80004001)
 #define DDERR_UNSUPPORTEDFORMAT MAKE_DDHRESULT(510)
 #define DDERR_UNSUPPORTEDMASK MAKE_DDHRESULT(520)
 #define DDERR_VERTICALBLANKINPROGRESS MAKE_DDHRESULT(537)