diff --git a/src/compiler/output-targets/dist-lazy/lazy-output.ts b/src/compiler/output-targets/dist-lazy/lazy-output.ts
index 076ddff0aba..1edc5969d8a 100644
--- a/src/compiler/output-targets/dist-lazy/lazy-output.ts
+++ b/src/compiler/output-targets/dist-lazy/lazy-output.ts
@@ -187,7 +187,7 @@ const getLazyEntry = (isBrowser: boolean): string => {
   } else {
     s.append(`import { globalScripts } from '${STENCIL_APP_GLOBALS_ID}';\n`);
     s.append(`export const defineCustomElements = (win, options) => {\n`);
-    s.append(`  if (typeof window === 'undefined') return Promise.resolve();\n`);
+    s.append(`  if (typeof window === 'undefined') return undefined;\n`);
     s.append(`  globalScripts();\n`);
     s.append(`  return bootstrapLazy([/*!__STENCIL_LAZY_DATA__*/], options);\n`);
     s.append(`};\n`);
diff --git a/src/compiler/output-targets/output-lazy-loader.ts b/src/compiler/output-targets/output-lazy-loader.ts
index f30ca3de43d..c3b9933c8c8 100644
--- a/src/compiler/output-targets/output-lazy-loader.ts
+++ b/src/compiler/output-targets/output-lazy-loader.ts
@@ -85,7 +85,7 @@ export interface CustomElementsDefineOptions {
   ael?: (el: EventTarget, eventName: string, listener: EventListenerOrEventListenerObject, options: boolean | AddEventListenerOptions) => void;
   rel?: (el: EventTarget, eventName: string, listener: EventListenerOrEventListenerObject, options: boolean | AddEventListenerOptions) => void;
 }
-export declare function defineCustomElements(win?: Window, opts?: CustomElementsDefineOptions): Promise<void>;
+export declare function defineCustomElements(win?: Window, opts?: CustomElementsDefineOptions): void;
 export declare function applyPolyfills(): Promise<void>;
 
 /**