diff --git a/docker/mjolnir/start.sh b/docker/mjolnir/start.sh
index b18c11e..50ccd94 100644
--- a/docker/mjolnir/start.sh
+++ b/docker/mjolnir/start.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-CONFIG_ROOT=/data/config
+CONFIG_ROOT="/data/config"
 CONFIG_PATH="/data/config/config.yaml"
 DEFAULT_CONFIG_PATH="/etc/mjolnir-defaults/default.yaml"
 HOME_SERVER_URL="${HOME_SERVER_URL:-https://matrix.org}"