diff --git a/dlls/dxgi/surface.c b/dlls/dxgi/surface.c
index 4b1b83b84a9..ad2c0d7ff1e 100644
--- a/dlls/dxgi/surface.c
+++ b/dlls/dxgi/surface.c
@@ -196,14 +196,12 @@ static HRESULT STDMETHODCALLTYPE dxgi_surface_Map(IDXGISurface1 *iface, DXGI_MAP
     if (flags & DXGI_MAP_DISCARD)
         wined3d_map_flags |= WINED3D_MAP_DISCARD;
 
-    wined3d_mutex_lock();
     if (SUCCEEDED(hr = wined3d_resource_map(wined3d_texture_get_resource(surface->wined3d_texture), 0,
             &wined3d_map_desc, NULL, wined3d_map_flags)))
     {
         mapped_rect->Pitch = wined3d_map_desc.row_pitch;
         mapped_rect->pBits = wined3d_map_desc.data;
     }
-    wined3d_mutex_unlock();
 
     return hr;
 }
@@ -213,11 +211,7 @@ static HRESULT STDMETHODCALLTYPE dxgi_surface_Unmap(IDXGISurface1 *iface)
     struct dxgi_surface *surface = impl_from_IDXGISurface1(iface);
 
     TRACE("iface %p.\n", iface);
-
-    wined3d_mutex_lock();
     wined3d_resource_unmap(wined3d_texture_get_resource(surface->wined3d_texture), 0);
-    wined3d_mutex_unlock();
-
     return S_OK;
 }