diff --git a/installers/common.sh b/installers/common.sh
old mode 100644
new mode 100755
index ce691ab..30a6717
--- a/installers/common.sh
+++ b/installers/common.sh
@@ -1,6 +1,6 @@
 msm_dir="/opt/msm"
 msm_user="minecraft"
-dl_dir="$(mktemp -t msm)"
+dl_dir="$(mktemp -t msm-XXX)"
 
 # Outputs an MSM INSTALL log line
 function install_log() {