diff --git a/inc/dd.h b/inc/dd.h
index c0d28ee..d82360d 100644
--- a/inc/dd.h
+++ b/inc/dd.h
@@ -14,6 +14,7 @@ HRESULT dd_SetDisplayMode(DWORD width, DWORD height, DWORD bpp);
 HRESULT dd_SetCooperativeLevel(HWND hwnd, DWORD dwFlags);
 HRESULT dd_RestoreDisplayMode();
 HRESULT dd_GetCaps(LPDDCAPS lpDDDriverCaps, LPDDCAPS lpDDEmulCaps);
+HRESULT dd_GetMonitorFrequency(LPDWORD lpdwFreq);
 HRESULT dd_GetAvailableVidMem(void* lpDDCaps, LPDWORD lpdwTotal, LPDWORD lpdwFree);
 HRESULT dd_GetVerticalBlankStatus(LPBOOL lpbIsInVB);
 
diff --git a/src/IDirectDraw/IDirectDraw.c b/src/IDirectDraw/IDirectDraw.c
index eab373e..6cc6acc 100644
--- a/src/IDirectDraw/IDirectDraw.c
+++ b/src/IDirectDraw/IDirectDraw.c
@@ -164,11 +164,11 @@ HRESULT __stdcall IDirectDraw__GetGDISurface(IDirectDrawImpl* This, LPDIRECTDRAW
     return ret;
 }
 
-HRESULT __stdcall IDirectDraw__GetMonitorFrequency(IDirectDrawImpl* This, LPDWORD a)
+HRESULT __stdcall IDirectDraw__GetMonitorFrequency(IDirectDrawImpl* This, LPDWORD lpdwFreq)
 {
-    dprintf("NOT_IMPLEMENTED -> %s(This=%p)\n", __FUNCTION__, This);
-    HRESULT ret = DD_OK;
-    dprintf("NOT_IMPLEMENTED <- %s\n", __FUNCTION__);
+    dprintf("-> %s(This=%p)\n", __FUNCTION__, This);
+    HRESULT ret = dd_GetMonitorFrequency(lpdwFreq);
+    dprintf("<- %s\n", __FUNCTION__);
     return ret;
 }
 
diff --git a/src/dd.c b/src/dd.c
index c9a587b..7a92681 100644
--- a/src/dd.c
+++ b/src/dd.c
@@ -177,6 +177,12 @@ HRESULT dd_GetCaps(LPDDCAPS lpDDDriverCaps, LPDDCAPS lpDDEmulCaps)
     return DD_OK;
 }
 
+HRESULT dd_GetMonitorFrequency(LPDWORD lpdwFreq)
+{
+    *lpdwFreq = 60;
+    return DD_OK;
+}
+
 HRESULT dd_RestoreDisplayMode()
 {
     if (!g_ddraw->render.run)