diff --git a/packages/common/src/pipes/intl.ts b/packages/common/src/pipes/intl.ts
index 8d786b22a1..483e89fd8c 100644
--- a/packages/common/src/pipes/intl.ts
+++ b/packages/common/src/pipes/intl.ts
@@ -172,7 +172,7 @@ function nameCondition(prop: string, len: number): Intl.DateTimeFormatOptions {
 }
 
 function combine(options: Intl.DateTimeFormatOptions[]): Intl.DateTimeFormatOptions {
-  return (<any>Object).assign({}, ...options);
+  return options.reduce((merged, opt) => ({...merged, ...opt}), {});
 }
 
 function datePartGetterFactory(ret: Intl.DateTimeFormatOptions): DateFormatterFn {