diff --git a/Makefile.in b/Makefile.in
index 029f0dd9..18db8f82 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -412,6 +412,7 @@ $(eval $(call rules-autoconf,wine,32))
 $(eval $(call rules-autoconf,wine,64))
 
 $(OBJ)/.wine-post-source:
+	-cd $(WINE_SRC) && tools/make_specfiles
 	cd $(WINE_SRC) && tools/make_requests
 	cd $(WINE_SRC) && dlls/winevulkan/make_vulkan -x vk.xml
 	touch $@