user32: Add support for RTL window layouts in MapWindowPoints.
diff --git a/server/request.h b/server/request.h
index 6cb37b3..55af0e1 100644
--- a/server/request.h
+++ b/server/request.h
@@ -1605,7 +1605,8 @@
 C_ASSERT( sizeof(struct get_windows_offset_request) == 24 );
 C_ASSERT( FIELD_OFFSET(struct get_windows_offset_reply, x) == 8 );
 C_ASSERT( FIELD_OFFSET(struct get_windows_offset_reply, y) == 12 );
-C_ASSERT( sizeof(struct get_windows_offset_reply) == 16 );
+C_ASSERT( FIELD_OFFSET(struct get_windows_offset_reply, mirror) == 16 );
+C_ASSERT( sizeof(struct get_windows_offset_reply) == 24 );
 C_ASSERT( FIELD_OFFSET(struct get_visible_region_request, window) == 12 );
 C_ASSERT( FIELD_OFFSET(struct get_visible_region_request, flags) == 16 );
 C_ASSERT( sizeof(struct get_visible_region_request) == 24 );