diff --git a/charts/argocd-notifications/templates/secret.yaml b/charts/argocd-notifications/templates/secret.yaml
index a5fc5527..9c32bd25 100644
--- a/charts/argocd-notifications/templates/secret.yaml
+++ b/charts/argocd-notifications/templates/secret.yaml
@@ -12,7 +12,7 @@ stringData:
     slack:
       token: {{ .Values.secret.notifiers.slack.token }}
       username: {{ .Values.secret.notifiers.slack.username }}
-      icon: {{ .Values.secret.notifiers.slack.icon }}
+      icon: "{{ .Values.secret.notifiers.slack.icon }}"
       signingSecret: {{ .Values.secret.notifiers.slack.signingSecret }}
 {{- end }}
 {{- if .Values.secret.notifiers.grafana.enabled }}