diff --git a/inc/dd.h b/inc/dd.h
index 750825d..9ee8049 100644
--- a/inc/dd.h
+++ b/inc/dd.h
@@ -15,15 +15,15 @@ typedef HRESULT(WINAPI* DIRECTDRAWCREATEPROC)(GUID FAR*, LPDIRECTDRAW FAR*, IUnk
 ULONG dd_AddRef();
 ULONG dd_Release();
 HRESULT dd_EnumDisplayModes(DWORD dwFlags, LPDDSURFACEDESC lpDDSurfaceDesc, LPVOID lpContext, LPDDENUMMODESCALLBACK lpEnumModesCallback);
-HRESULT dd_WaitForVerticalBlank(DWORD dwFlags, HANDLE hEvent);
-HRESULT dd_SetDisplayMode(DWORD dwWidth, DWORD dwHeight, DWORD dwBPP, DWORD dwFlags);
-HRESULT dd_SetCooperativeLevel(HWND hwnd, DWORD dwFlags);
-HRESULT dd_RestoreDisplayMode();
 HRESULT dd_GetCaps(LPDDCAPS_DX1 lpDDDriverCaps, LPDDCAPS_DX1 lpDDEmulCaps);
 HRESULT dd_GetDisplayMode(LPDDSURFACEDESC lpDDSurfaceDesc);
 HRESULT dd_GetMonitorFrequency(LPDWORD lpdwFreq);
-HRESULT dd_GetAvailableVidMem(LPDDSCAPS lpDDCaps, LPDWORD lpdwTotal, LPDWORD lpdwFree);
 HRESULT dd_GetVerticalBlankStatus(LPBOOL lpbIsInVB);
+HRESULT dd_RestoreDisplayMode();
+HRESULT dd_SetCooperativeLevel(HWND hwnd, DWORD dwFlags);
+HRESULT dd_SetDisplayMode(DWORD dwWidth, DWORD dwHeight, DWORD dwBPP, DWORD dwFlags);
+HRESULT dd_WaitForVerticalBlank(DWORD dwFlags, HANDLE hEvent);
+HRESULT dd_GetAvailableVidMem(LPDDSCAPS lpDDCaps, LPDWORD lpdwTotal, LPDWORD lpdwFree);
 HRESULT dd_TestCooperativeLevel();
 HRESULT dd_GetDeviceIdentifier(LPDDDEVICEIDENTIFIER pDDDI, DWORD dwFlags, REFIID riid);
 HRESULT dd_CreateEx(GUID* lpGuid, LPVOID* lplpDD, REFIID iid, IUnknown* pUnkOuter);
diff --git a/src/dd.c b/src/dd.c
index b64c320..1be2ec9 100644
--- a/src/dd.c
+++ b/src/dd.c
@@ -587,6 +587,27 @@ HRESULT dd_GetMonitorFrequency(LPDWORD lpdwFreq)
     return DD_OK;
 }
 
+HRESULT dd_GetVerticalBlankStatus(LPBOOL lpbIsInVB)
+{
+    if (!lpbIsInVB)
+        return DDERR_INVALIDPARAMS;
+
+    static DWORD last_vb;
+    DWORD tick = GetTickCount();
+
+    if (last_vb + 16 > tick)
+    {
+        *lpbIsInVB = FALSE;
+    }
+    else
+    {
+        last_vb = tick;
+        *lpbIsInVB = TRUE;
+    }
+
+    return DD_OK;
+}
+
 HRESULT dd_RestoreDisplayMode()
 {
     if (!g_ddraw.render.run)
@@ -1685,14 +1706,6 @@ HRESULT dd_GetAvailableVidMem(LPDDSCAPS lpDDCaps, LPDWORD lpdwTotal, LPDWORD lpd
     return DD_OK;
 }
 
-HRESULT dd_GetVerticalBlankStatus(LPBOOL lpbIsInVB)
-{
-    if (lpbIsInVB)
-        *lpbIsInVB = TRUE;
-
-    return DD_OK;
-}
-
 HRESULT dd_TestCooperativeLevel()
 {
     if (g_config.limiter_type == LIMIT_TESTCOOP && g_ddraw.ticks_limiter.tick_length > 0)