diff --git a/dlls/ddraw/surface.c b/dlls/ddraw/surface.c
index edb9485fc0e..71b424d5e75 100644
--- a/dlls/ddraw/surface.c
+++ b/dlls/ddraw/surface.c
@@ -1159,7 +1159,7 @@ static HRESULT WINAPI DECLSPEC_HOTPATCH ddraw_surface7_Unlock(IDirectDrawSurface
     TRACE("iface %p, rect %s.\n", iface, wine_dbgstr_rect(pRect));
 
     wined3d_mutex_lock();
-    hr = wined3d_surface_unmap(surface->wined3d_surface);
+    hr = wined3d_resource_unmap(wined3d_texture_get_resource(surface->wined3d_texture), surface->sub_resource_idx);
     if (SUCCEEDED(hr) && surface->surface_desc.ddsCaps.dwCaps & DDSCAPS_PRIMARYSURFACE)
         hr = ddraw_surface_update_frontbuffer(surface, &surface->ddraw->primary_lock, FALSE);
     wined3d_mutex_unlock();
diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index 657ef123c29..a98f7673d61 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -2418,7 +2418,7 @@ do { \
     return WINED3D_OK;
 }
 
-HRESULT CDECL wined3d_surface_unmap(struct wined3d_surface *surface)
+HRESULT wined3d_surface_unmap(struct wined3d_surface *surface)
 {
     TRACE("surface %p.\n", surface);
 
diff --git a/dlls/wined3d/wined3d.spec b/dlls/wined3d/wined3d.spec
index 6ff315199a4..6f930efb913 100644
--- a/dlls/wined3d/wined3d.spec
+++ b/dlls/wined3d/wined3d.spec
@@ -227,7 +227,6 @@
 @ cdecl wined3d_surface_get_pitch(ptr)
 @ cdecl wined3d_surface_get_resource(ptr)
 @ cdecl wined3d_surface_set_overlay_position(ptr long long)
-@ cdecl wined3d_surface_unmap(ptr)
 @ cdecl wined3d_surface_update_overlay(ptr ptr ptr ptr long ptr)
 @ cdecl wined3d_surface_update_overlay_z_order(ptr long ptr)
 
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index 94c700519e0..965b012eb5f 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -2559,6 +2559,7 @@ void surface_set_compatible_renderbuffer(struct wined3d_surface *surface,
         const struct wined3d_surface *rt) DECLSPEC_HIDDEN;
 void surface_set_texture_target(struct wined3d_surface *surface, GLenum target, GLint level) DECLSPEC_HIDDEN;
 void surface_translate_drawable_coords(const struct wined3d_surface *surface, HWND window, RECT *rect) DECLSPEC_HIDDEN;
+HRESULT wined3d_surface_unmap(struct wined3d_surface *surface) DECLSPEC_HIDDEN;
 HRESULT wined3d_surface_update_desc(struct wined3d_surface *surface,
         const struct wined3d_gl_info *gl_info, void *mem, unsigned int pitch) DECLSPEC_HIDDEN;
 HRESULT surface_upload_from_surface(struct wined3d_surface *dst_surface, const POINT *dst_point,
diff --git a/include/wine/wined3d.h b/include/wine/wined3d.h
index 04b022c1fdc..f29f4fffa51 100644
--- a/include/wine/wined3d.h
+++ b/include/wine/wined3d.h
@@ -2480,7 +2480,6 @@ void * __cdecl wined3d_surface_get_parent(const struct wined3d_surface *surface)
 DWORD __cdecl wined3d_surface_get_pitch(const struct wined3d_surface *surface);
 struct wined3d_resource * __cdecl wined3d_surface_get_resource(struct wined3d_surface *surface);
 HRESULT __cdecl wined3d_surface_set_overlay_position(struct wined3d_surface *surface, LONG x, LONG y);
-HRESULT __cdecl wined3d_surface_unmap(struct wined3d_surface *surface);
 HRESULT __cdecl wined3d_surface_update_overlay(struct wined3d_surface *surface, const RECT *src_rect,
         struct wined3d_surface *dst_surface, const RECT *dst_rect, DWORD flags, const WINEDDOVERLAYFX *fx);
 HRESULT __cdecl wined3d_surface_update_overlay_z_order(struct wined3d_surface *surface,