diff --git a/settings.json.docker b/settings.json.docker
index 49126a96d..c335bcc07 100644
--- a/settings.json.docker
+++ b/settings.json.docker
@@ -177,7 +177,7 @@
    * This is used by the monitoring plugins to collect metrics about Etherpad.
    * If you do not use any monitoring plugins, you can disable this.
    */
-  "enableMetrics": ${ENABLE_METRICS:true},
+  "enableMetrics": "${ENABLE_METRICS:true}",
 
   /*
    * Settings for cleanup of pads
diff --git a/settings.json.template b/settings.json.template
index b9de2fbec..8a2b72dd9 100644
--- a/settings.json.template
+++ b/settings.json.template
@@ -168,7 +168,7 @@
    * This is used by the monitoring plugins to collect metrics about Etherpad.
    * If you do not use any monitoring plugins, you can disable this.
    */
-   "enableMetrics": ${ENABLE_METRICS:true},
+   "enableMetrics": "${ENABLE_METRICS:true}",
 
   /*
    * Settings for cleanup of pads