diff --git a/charts/opensearch-operator/templates/opensearch-operator-controller-manager-deployment.yaml b/charts/opensearch-operator/templates/opensearch-operator-controller-manager-deployment.yaml
index 23f9124..eed280c 100755
--- a/charts/opensearch-operator/templates/opensearch-operator-controller-manager-deployment.yaml
+++ b/charts/opensearch-operator/templates/opensearch-operator-controller-manager-deployment.yaml
@@ -52,7 +52,7 @@ spec:
           - name: BUSYBOX_TAG
             value: {{ .Values.cluster.busybox.tag }}
           - name: LOG_FORMAT
-            value: {{ .Values.logFormat | default false }}
+            value: {{ .Values.logFormat | default "plaintext" }}
              
         image: "{{ .Values.localRegistry | default "docker.io" }}{{"/"}}{{ .Values.namespaceOverride | default "radondb" }}{{"/"}}{{ .Values.manager.image }}:{{ .Values.manager.tag | default .Chart.AppVersion }}"
         name: operator-controller-manager
diff --git a/charts/opensearch-operator/values.yaml b/charts/opensearch-operator/values.yaml
index 58e498f..046d1b7 100644
--- a/charts/opensearch-operator/values.yaml
+++ b/charts/opensearch-operator/values.yaml
@@ -23,10 +23,9 @@ namespaceOverride: radondb
 pullPolicy: Always
 
 # format output log
-# - false : plaintext (default)
-# - true  : json
-logFormat: false
-
+# - plaintext (default)
+# - json
+logFormat: plaintext
 
 cluster:
   openSearch: