diff --git a/helm/easyhaproxy/templates/deployment.yaml b/helm/easyhaproxy/templates/deployment.yaml
index 23d518e..b4c978e 100644
--- a/helm/easyhaproxy/templates/deployment.yaml
+++ b/helm/easyhaproxy/templates/deployment.yaml
@@ -44,7 +44,7 @@ spec:
               containerPort: 1936
               hostPort: 1936
             {{ range .Values.listen_extra_ports }}
-            - name: extra_{{ . }}
+            - name: extra{{ . }}
               containerPort: {{ . }}
               hostPort: {{ . }}
             {{- end }}