diff --git a/ddraw.def b/ddraw.def
index c2b0db0..20f0c25 100644
--- a/ddraw.def
+++ b/ddraw.def
@@ -6,3 +6,4 @@ EXPORTS
     GameHandlesClose                     DATA
     NvOptimusEnablement                  DATA
     AmdPowerXpressRequestHighPerformance DATA
+    pvBmpBits                            DATA
diff --git a/src/surface.c b/src/surface.c
index 5c84db9..b1cdc98 100644
--- a/src/surface.c
+++ b/src/surface.c
@@ -29,6 +29,7 @@ void dump_ddbltflags(DWORD dwFlags);
 void dump_ddscaps(DWORD dwCaps);
 void dump_ddsd(DWORD dwFlags);
 DWORD WINAPI render_soft_main(void);
+void *pvBmpBits;
 
 HRESULT __stdcall ddraw_surface_QueryInterface(IDirectDrawSurfaceImpl *This, REFIID riid, void **obj)
 {
@@ -1199,6 +1200,9 @@ HRESULT __stdcall ddraw_CreateSurface(IDirectDrawImpl *This, LPDDSURFACEDESC lpD
         if (!Surface->bitmap)
             Surface->surface = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, Surface->lPitch * (Surface->height + 200) * Surface->lXPitch);
 
+        if (lpDDSurfaceDesc->ddsCaps.dwCaps & DDSCAPS_PRIMARYSURFACE)
+            pvBmpBits = Surface->surface;
+
         SelectObject(Surface->hDC, Surface->bitmap);
     }