diff --git a/docs/metrics/020_metrics.adoc b/docs/metrics/020_metrics.adoc
index 429558a3..719a802b 100644
--- a/docs/metrics/020_metrics.adoc
+++ b/docs/metrics/020_metrics.adoc
@@ -48,8 +48,8 @@ metadata:
   name: metrics-cluster
 spec:
   env:
-    - name: COHERENCE_METRICS_LEGACY_NAMES
-      value: false
+    - name: "COHERENCE_METRICS_LEGACY_NAMES"
+      value: "false"
   coherence:
 ...
 ----