diff --git a/ibus.spec b/ibus.spec
index fc208c6..e5fdf43 100644
--- a/ibus.spec
+++ b/ibus.spec
@@ -319,6 +319,7 @@ autoreconf -f -i -v
     --enable-introspection \
     --enable-install-tests \
     %{nil}
+make -C ui/gtk3 maintainer-clean-generic
 
 %make_build