diff --git a/charts/argo-events/templates/argo-events-controller/servicemonitor.yaml b/charts/argo-events/templates/argo-events-controller/servicemonitor.yaml
index 9120ae98..55cda1d4 100644
--- a/charts/argo-events/templates/argo-events-controller/servicemonitor.yaml
+++ b/charts/argo-events/templates/argo-events-controller/servicemonitor.yaml
@@ -3,7 +3,7 @@ apiVersion: monitoring.coreos.com/v1
 kind: ServiceMonitor
 metadata:
   name: {{ template "argo-events.controller.fullname" . }}
-  namespace: {{ default .Release.Namespace .Values.controller.metrics.serviceMonitor.namespace }}
+  namespace: {{ default .Release.Namespace .Values.controller.metrics.serviceMonitor.namespace | quote }}
   labels:
     {{- include "argo-events.labels" (dict "context" . "component" .Values.controller.name "name" .Values.controller.name) | nindent 4 }}
     {{- with .Values.controller.metrics.serviceMonitor.selector }}