diff --git a/content/en/docs/ops/app-health-check/index.md b/content/en/docs/ops/app-health-check/index.md
index 68e1c2847e..66dc269f7f 100644
--- a/content/en/docs/ops/app-health-check/index.md
+++ b/content/en/docs/ops/app-health-check/index.md
@@ -106,7 +106,7 @@ You have two ways to enable Istio to rewrite the liveness HTTP probes.
 **Alternatively**, update the configuration map of Istio sidecar injection:
 
 {{< text bash >}}
-$ kubectl get cm istio-sidecar-injector -n istio-system -o yaml | sed -e "s/ rewriteAppHTTPProbe: false/ rewriteAppHTTPProbe: true/" | kubectl apply -f -
+$ kubectl get cm istio-sidecar-injector -n istio-system -o yaml | sed -e 's/"rewriteAppHTTPProbe":false/"rewriteAppHTTPProbe":true/' | kubectl apply -f -
 {{< /text >}}
 
 The above installation option and configuration map, each instruct the sidecar injection process to automatically