diff --git a/script/helm/garage/templates/workload.yaml b/script/helm/garage/templates/workload.yaml
index 81c8616f..21c6462d 100644
--- a/script/helm/garage/templates/workload.yaml
+++ b/script/helm/garage/templates/workload.yaml
@@ -94,7 +94,7 @@ spec:
       volumes:
         - name: configmap
           configMap:
-            name: {{ include "garage.fullname" . }}-config
+            name: {{ if .Values.garage.existingConfigMap }}{{ .Values.garage.existingConfigMap }}{{ else }}{{ include "garage.fullname" . }}-config{{ end }}
         - name: etc
           emptyDir: {}
         {{- if .Values.persistence.enabled }}