diff --git a/packages/compiler/src/i18n/message_bundle.ts b/packages/compiler/src/i18n/message_bundle.ts
index 54c7245580..e685478367 100644
--- a/packages/compiler/src/i18n/message_bundle.ts
+++ b/packages/compiler/src/i18n/message_bundle.ts
@@ -26,7 +26,7 @@ export class MessageBundle {
       private _implicitAttrs: {[k: string]: string[]}, private _locale: string|null = null) {}
 
   updateFromTemplate(html: string, url: string, interpolationConfig: InterpolationConfig):
-      ParseError[]|null {
+      ParseError[] {
     const htmlParserResult = this._htmlParser.parse(html, url, true, interpolationConfig);
 
     if (htmlParserResult.errors.length) {
@@ -41,7 +41,7 @@ export class MessageBundle {
     }
 
     this._messages.push(...i18nParserResult.messages);
-    return null;
+    return [];
   }
 
   // Return the message in the internal format