diff --git a/reactos/include/psdk/winuser.h b/reactos/include/psdk/winuser.h
index f488422ea6d..db3774d1b58 100644
--- a/reactos/include/psdk/winuser.h
+++ b/reactos/include/psdk/winuser.h
@@ -1921,6 +1921,7 @@ extern "C" {
 #define DCX_EXCLUDERGN 64
 #define DCX_INTERSECTRGN 128
 #define DCX_VALIDATE 0x200000
+#define DCX_EXCLUDEUPDATE   0x100
 #define GMDI_GOINTOPOPUPS 2
 #define GMDI_USEDISABLED 1
 #define FKF_AVAILABLE 2
diff --git a/reactos/subsystems/win32/win32k/include/dce.h b/reactos/subsystems/win32/win32k/include/dce.h
index e2487b4b771..7257797e239 100644
--- a/reactos/subsystems/win32/win32k/include/dce.h
+++ b/reactos/subsystems/win32/win32k/include/dce.h
@@ -37,7 +37,6 @@ typedef struct tagDCE
 } DCE;  /* PDCE already declared at top of file */
 
 /* internal DCX flags, see psdk/winuser.h for the rest */
-#define DCX_EXCLUDEUPDATE	0x00000100
 #define DCX_DCEEMPTY		0x00000800
 #define DCX_DCEBUSY		0x00001000
 #define DCX_DCEDIRTY		0x00002000