diff --git a/m17n-lib.spec b/m17n-lib.spec
index 8a22e20..376e089 100644
--- a/m17n-lib.spec
+++ b/m17n-lib.spec
@@ -55,8 +55,9 @@ autoreconf
 %configure --disable-static \
 %if ! %{with_gui}
   --with-gui=no
+%else
+  %{nil}
 %endif
-
 make