diff --git a/core/api.txt b/core/api.txt
index 222f6da89f..d875b9baba 100644
--- a/core/api.txt
+++ b/core/api.txt
@@ -663,7 +663,7 @@ ion-menu-controller,method,isAnimating,isAnimating() => Promise<boolean>
 ion-menu-controller,method,isEnabled,isEnabled(menu?: string | null | undefined) => Promise<boolean>
 ion-menu-controller,method,isOpen,isOpen(menu?: string | null | undefined) => Promise<boolean>
 ion-menu-controller,method,open,open(menu?: string | null | undefined) => Promise<boolean>
-ion-menu-controller,method,registerAnimation,registerAnimation(name: string, animation: ((menu: MenuI) => IonicAnimation) | AnimationBuilder) => Promise<void>
+ion-menu-controller,method,registerAnimation,registerAnimation(name: string, animation: AnimationBuilder | ((menu: MenuI) => IonicAnimation)) => Promise<void>
 ion-menu-controller,method,swipeGesture,swipeGesture(enable: boolean, menu?: string | null | undefined) => Promise<HTMLIonMenuElement | undefined>
 ion-menu-controller,method,toggle,toggle(menu?: string | null | undefined) => Promise<boolean>
 
diff --git a/core/src/components/menu-controller/menu-controller.ts b/core/src/components/menu-controller/menu-controller.ts
index 64235fa624..21b53c0851 100644
--- a/core/src/components/menu-controller/menu-controller.ts
+++ b/core/src/components/menu-controller/menu-controller.ts
@@ -226,7 +226,7 @@ export class MenuController implements MenuControllerI {
    * @param animation The animation function to register.
    */
   @Method()
-  async registerAnimation(name: string, animation: ((menu: MenuI) => IonicAnimation) | AnimationBuilder) {
+  async registerAnimation(name: string, animation: AnimationBuilder | ((menu: MenuI) => IonicAnimation)) {
     this.menuAnimations.set(name, animation);
   }
 
diff --git a/core/src/components/menu-controller/readme.md b/core/src/components/menu-controller/readme.md
index 7887a43e01..f51a9fe48a 100644
--- a/core/src/components/menu-controller/readme.md
+++ b/core/src/components/menu-controller/readme.md
@@ -116,7 +116,7 @@ Type: `Promise<boolean>`
 
 
 
-### `registerAnimation(name: string, animation: ((menu: MenuI) => IonicAnimation) | AnimationBuilder) => Promise<void>`
+### `registerAnimation(name: string, animation: AnimationBuilder | ((menu: MenuI) => IonicAnimation)) => Promise<void>`
 
 Registers a new animation that can be used with any `ion-menu` by
 passing the name of the animation in its `type` property.