diff --git a/tests/test_deploy b/tests/test_deploy
index ac1961e89..2ccc28ffa 100755
--- a/tests/test_deploy
+++ b/tests/test_deploy
@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e
 SELF=`which $0`; APP="$1"; TARGET="$2"
-TMP=$(mktemp -d -t $TARGET)
+TMP=$(mktemp -d -t "$TARGET.XXXXX")
 trap "rm -rf $TMP" EXIT
 cp -r $(dirname $SELF)/$APP/* $TMP
 cd $TMP