diff --git a/apis/apps/v2beta1/emqx_types.go b/apis/apps/v2beta1/emqx_types.go
index 5239a72c6..1d1e65218 100644
--- a/apis/apps/v2beta1/emqx_types.go
+++ b/apis/apps/v2beta1/emqx_types.go
@@ -100,7 +100,7 @@ type BootstrapAPIKey struct {
 }
 
 type Config struct {
-	//+kubebuilder:validation:Enum=merge;replace
+	//+kubebuilder:validation:Enum=Merge;Replace
 	//+kubebuilder:default=merge
 	Mode string `json:"mode,omitempty"`
 	// EMQX config, HOCON format, like etc/emqx.conf file
diff --git a/config/crd/bases/apps.emqx.io_emqxes.yaml b/config/crd/bases/apps.emqx.io_emqxes.yaml
index a31dd4521..08311b356 100644
--- a/config/crd/bases/apps.emqx.io_emqxes.yaml
+++ b/config/crd/bases/apps.emqx.io_emqxes.yaml
@@ -6507,8 +6507,8 @@ spec:
                   mode:
                     default: merge
                     enum:
-                    - merge
-                    - replace
+                    - Merge
+                    - Replace
                     type: string
                 type: object
               coreTemplate:
diff --git a/deploy/charts/emqx-operator/templates/crd.emqxes.apps.emqx.io.yaml b/deploy/charts/emqx-operator/templates/crd.emqxes.apps.emqx.io.yaml
index d75ccbe36..1f297de69 100644
--- a/deploy/charts/emqx-operator/templates/crd.emqxes.apps.emqx.io.yaml
+++ b/deploy/charts/emqx-operator/templates/crd.emqxes.apps.emqx.io.yaml
@@ -6519,8 +6519,8 @@ spec:
                     mode:
                       default: merge
                       enum:
-                        - merge
-                        - replace
+                        - Merge
+                        - Replace
                       type: string
                   type: object
                 coreTemplate: