diff --git a/librb/autogen.sh b/librb/autogen.sh
index 3eaa78b60..03a67ed2a 100755
--- a/librb/autogen.sh
+++ b/librb/autogen.sh
@@ -80,7 +80,7 @@ parse_options "$@"
 
 cd $TOP_DIR
 
-run_or_die $ACLOCAL
+run_or_die $ACLOCAL -I ../m4
 run_or_die $LIBTOOLIZE --force --copy
 run_or_die $AUTOHEADER
 run_or_die $AUTOCONF