diff --git a/reactos/include/psdk/wingdi.h b/reactos/include/psdk/wingdi.h
index 550ef68c626..052b04be334 100644
--- a/reactos/include/psdk/wingdi.h
+++ b/reactos/include/psdk/wingdi.h
@@ -1319,6 +1319,7 @@ extern "C" {
 #define LAYOUT_VBH 4 // Vertical before horizontal
 #define LAYOUT_ORIENTATIONMASK (LAYOUT_RTL | LAYOUT_BTT | LAYOUT_VBH)
 #define LAYOUT_BITMAPORIENTATIONPRESERVED 8
+#define NOMIRRORBITMAP 0x80000000
 #if (WINVER > 0x400)
 #define CS_ENABLE           0x00000001
 #define CS_DISABLE          0x00000002