diff --git a/test/run b/test/run
index e8674c60..d42c8ac9 100755
--- a/test/run
+++ b/test/run
@@ -7,7 +7,7 @@ main() {
   number_failures=0
   dirs="$@"
   test=$(pwd)
-  work=$(mktemp --directory)
+  work=$(mktemp -d)
   cp -R . $work
   trap "rm -R $work" EXIT
   for dir in $(find $dirs -type d); do