diff --git a/reactos/include/reactos/drivers/directx/dxeng.h b/reactos/include/reactos/drivers/directx/dxeng.h
index d3174038374..ef4ab88e18f 100644
--- a/reactos/include/reactos/drivers/directx/dxeng.h
+++ b/reactos/include/reactos/drivers/directx/dxeng.h
@@ -80,6 +80,7 @@ BOOL DxEngSetDeviceGammaRamp(HDEV hPDev, PGAMMARAMP Ramp, BOOL Unuse);
 
 BOOLEAN DxEngLockShareSem();
 BOOLEAN DxEngUnlockShareSem();
+BOOLEAN DxEngCleanDC(HDC hdc);
 
 /* prototypes are not done yet, I need gather all my notes
  * to make them correct
@@ -99,7 +100,6 @@ DWORD DxEngGetHdevData(PEDD_DIRECTDRAW_GLOBAL pEDDgpl, DWORD Index);
 DWORD DxEngSetHdevData(DWORD x1, DWORD x2, DWORD x3);
 DWORD DxEngGetDesktopDC(DWORD x1, DWORD x2, DWORD x3);
 DWORD DxEngDeleteDC(DWORD x1, DWORD x2);
-DWORD DxEngCleanDC(DWORD x1);
 DWORD DxEngSetDCOwner(DWORD x1, DWORD x2);
 DWORD DxEngSetDCState(DWORD x1, DWORD x2, DWORD x3);
 DWORD DxEngGetDCState(HDC hDC, DWORD type);
diff --git a/reactos/subsystems/win32/win32k/ntddraw/dxeng.c b/reactos/subsystems/win32/win32k/ntddraw/dxeng.c
index 309054528fb..ee7059d60e5 100644
--- a/reactos/subsystems/win32/win32k/ntddraw/dxeng.c
+++ b/reactos/subsystems/win32/win32k/ntddraw/dxeng.c
@@ -411,7 +411,7 @@ DWORD DxEngDeleteDC(DWORD x1, DWORD x2)
 /************************************************************************/
 /* DxEngCleanDC                                                         */
 /************************************************************************/
-DWORD DxEngCleanDC(DWORD x1)
+BOOLEAN DxEngCleanDC(HDC hdc)
 {
     UNIMPLEMENTED;
     return FALSE;