diff --git a/tests/test_shelve2json.sh b/tests/test_shelve2json.sh
index 7301128..477b38b 100644
--- a/tests/test_shelve2json.sh
+++ b/tests/test_shelve2json.sh
@@ -1,8 +1,7 @@
 #!/usr/bin/env bash
 set -e -x
 
-#tmp=$(mktemp)
-tmp="test"
+tmp=$(mktemp tmp-XXXXXXXXXX)
 uname -s
 rm -f "$tmp"
 python3 -c 'import shelve; db=shelve.open("'"$tmp"'", flag="n"); db["eggs"] = "eggs"; db.sync(); db.close()'