Fix vapi/Makefile.am

diff --git a/vapi/Makefile.am b/vapi/Makefile.am
index b66ef4b8e8c28f3f6dad5d58adaa95e385800e0a..9bc3e82f078d7577c6cbc73e784638a63f53a27d 100644 (file)
--- a/vapi/Makefile.am
+++ b/vapi/Makefile.am
@@ -178,7 +178,7 @@ dist_vapi_DATA = \
        x11.vapi \
        xcb.vapi \
        zlib.vapi \
-       $(null)
+       $(NULL)
 
 dist_noinst_DATA = \
        config.vapi \