diff --git a/reactos/include/reactos/drivers/directx/dxeng.h b/reactos/include/reactos/drivers/directx/dxeng.h
index b25eaeefe86..4cca2d86ec6 100644
--- a/reactos/include/reactos/drivers/directx/dxeng.h
+++ b/reactos/include/reactos/drivers/directx/dxeng.h
@@ -83,6 +83,7 @@ DWORD STDCALL DxEngGetDCState(HDC hDC, DWORD type);
 DWORD STDCALL DxEngReferenceHdev(HDEV hdev);
 BOOLEAN STDCALL DxEngLockShareSem();
 BOOLEAN STDCALL DxEngUnlockShareSem();
+DWORD STDCALL DxEngScreenAccessCheck();
 
 /* prototypes are not done yet, I need gather all my notes
  * to make them correct
@@ -97,7 +98,7 @@ BOOLEAN DxEngCleanDC(HDC hdc);
 BOOLEAN DxEngIncDispUniq();
 
 DWORD DxEngCreateMemoryDC(DWORD x1);
-DWORD DxEngScreenAccessCheck();
+
 DWORD DxEngIsHdevLockedByCurrentThread(DWORD x1);
 DWORD DxEngUnreferenceHdev(DWORD x1);
 DWORD DxEngSpTearDownSprites(DWORD x1, DWORD x2, DWORD x3);
diff --git a/reactos/subsystems/win32/win32k/ntddraw/dxeng.c b/reactos/subsystems/win32/win32k/ntddraw/dxeng.c
index 01539a3ce7c..0232ab050a6 100644
--- a/reactos/subsystems/win32/win32k/ntddraw/dxeng.c
+++ b/reactos/subsystems/win32/win32k/ntddraw/dxeng.c
@@ -653,7 +653,7 @@ DWORD DxEngCreateMemoryDC(DWORD x1)
 /************************************************************************/
 /* DxEngScreenAccessCheck                                               */
 /************************************************************************/
-DWORD DxEngScreenAccessCheck()
+DWORD STDCALL DxEngScreenAccessCheck()
 {
     UNIMPLEMENTED;