diff --git a/salt/common/tools/sbin/so-repo-sync b/salt/common/tools/sbin/so-repo-sync
index c69aa44ad..1c09ae60d 100644
--- a/salt/common/tools/sbin/so-repo-sync
+++ b/salt/common/tools/sbin/so-repo-sync
@@ -7,6 +7,11 @@
 
 . /usr/sbin/so-common
 
+if [ ! -f /root/repodownload.conf ]; then
+    echo "This script should only run on the manager."
+    exit 1
+fi
+
 set_version
 set_os
 salt_minion_count