diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index 87de9e1879d..628a4a5b181 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -3068,7 +3068,7 @@ HRESULT CDECL wined3d_surface_map(struct wined3d_surface *surface,
      * mapped regularly do not throw away the system memory copy. This avoids
      * the need to download the surface from OpenGL all the time. The surface
      * is still downloaded if the OpenGL texture is changed. */
-    if (!(surface->flags & SFLAG_DYNLOCK))
+    if (!(surface->flags & SFLAG_DYNLOCK) && surface->map_binding == WINED3D_LOCATION_SYSMEM)
     {
         if (++surface->lockCount > MAXLOCKCOUNT)
         {