--- a/autotools/check-man-warnings	2015-12-03 19:50:34.000000000 +0000
+++ b/autotools/check-man-warnings	2016-05-22 11:19:31.678635696 +0000
@@ -35,7 +35,7 @@
 	loc="en_US.UTF-8"
 fi
 
-! LANG="$loc" LC_ALL="$loc" MANWIDTH=80 \
+LANG="$loc" LC_ALL="$loc" MANWIDTH=80 \
   man --warnings --encoding=utf8 --local-file "$1" 2>&1 >/dev/null | \
   grep -v -e "cannot adjust line" -e "can't break line" | \
   grep .