diff --git a/charts/gha-runner-scale-set-experimental/templates/_mode_kubernetes.tpl b/charts/gha-runner-scale-set-experimental/templates/_mode_kubernetes.tpl
index 90800e80..672c8495 100644
--- a/charts/gha-runner-scale-set-experimental/templates/_mode_kubernetes.tpl
+++ b/charts/gha-runner-scale-set-experimental/templates/_mode_kubernetes.tpl
@@ -85,7 +85,7 @@ volumeMounts:
   {{- with .Values.runner.container.volumeMounts }}
     {{- toYaml . | nindent 2 }}
   {{- end }}
-  {{ include "githubServerTLS.volumeMountItem" (dict "root" $ "existingVolumeMounts" (.Values.runner.container.volumeMounts | default list)) | nindent 2 }}
+  {{ include "githubServerTLS.volumeMountItem" (dict "root" $ "existingVolumeMounts" (.Values.runner.container.volumeMounts | default (list))) | nindent 2 }}
 {{- end }}
 
 {{- define "runner-mode-kubernetes.pod-volumes" -}}