diff --git a/packages/runtime-core/src/component.ts b/packages/runtime-core/src/component.ts
index 2bf25ac8e47..f420a678a2f 100644
--- a/packages/runtime-core/src/component.ts
+++ b/packages/runtime-core/src/component.ts
@@ -1239,6 +1239,12 @@ export function isClassComponent(value: unknown): value is ClassComponent {
 }
 
 export interface ComponentCustomElementInterface {
-  injectChildStyle(type: ConcreteComponent): void
-  removeChildStyle(type: ConcreteComponent): void
+  /**
+   * @internal
+   */
+  _injectChildStyle(type: ConcreteComponent): void
+  /**
+   * @internal
+   */
+  _removeChildStyle(type: ConcreteComponent): void
 }
diff --git a/packages/runtime-core/src/hmr.ts b/packages/runtime-core/src/hmr.ts
index 926d3fa0a51..19ff20de30b 100644
--- a/packages/runtime-core/src/hmr.ts
+++ b/packages/runtime-core/src/hmr.ts
@@ -162,7 +162,7 @@ function reload(id: string, newComp: HMRComponent) {
 
     // update custom element child style
     if (instance.root.ce && instance !== instance.root) {
-      instance.root.ce.removeChildStyle(oldComp)
+      instance.root.ce._removeChildStyle(oldComp)
     }
   }
 
diff --git a/packages/runtime-core/src/renderer.ts b/packages/runtime-core/src/renderer.ts
index 588a58e34ca..2415307bb5f 100644
--- a/packages/runtime-core/src/renderer.ts
+++ b/packages/runtime-core/src/renderer.ts
@@ -1337,7 +1337,7 @@ function baseCreateRenderer(
         } else {
           // custom element style injection
           if (root.ce) {
-            root.ce.injectChildStyle(type)
+            root.ce._injectChildStyle(type)
           }
 
           if (__DEV__) {
diff --git a/packages/runtime-dom/src/apiCustomElement.ts b/packages/runtime-dom/src/apiCustomElement.ts
index 2684e97ea51..6af68193a08 100644
--- a/packages/runtime-dom/src/apiCustomElement.ts
+++ b/packages/runtime-dom/src/apiCustomElement.ts
@@ -609,11 +609,17 @@ export class VueElement
     }
   }
 
-  injectChildStyle(comp: ConcreteComponent & CustomElementOptions) {
+  /**
+   * @internal
+   */
+  _injectChildStyle(comp: ConcreteComponent & CustomElementOptions) {
     this._applyStyles(comp.styles, comp)
   }
 
-  removeChildStyle(comp: ConcreteComponent): void {
+  /**
+   * @internal
+   */
+  _removeChildStyle(comp: ConcreteComponent): void {
     if (__DEV__) {
       this._styleChildren.delete(comp)
       if (this._childStyles && comp.__hmrId) {