diff --git a/test.sh b/test.sh
index 3d671ed0..084d06aa 100755
--- a/test.sh
+++ b/test.sh
@@ -8,7 +8,7 @@ if [ ! -f "tile38-server" ];then
 	./build.sh
 fi
 
-TMP="$(mktemp -d -t data-test)"
+TMP="$(mktemp -d -t data-test.XXXX)"
 ./tile38-server -p 9876 -d "$TMP" -q &
 PID=$!
 function end {