diff --git a/packages/common/http/src/params.ts b/packages/common/http/src/params.ts
index 4298b6d49e44b..09cbf2c492007 100755
--- a/packages/common/http/src/params.ts
+++ b/packages/common/http/src/params.ts
@@ -84,7 +84,7 @@ export interface HttpParamsOptions {
   fromString?: string;
 
   /** Object map of the HTTP params. Mutually exclusive with `fromString`. */
-  fromObject?: {[param: string]: string | string[]};
+  fromObject?: {[param: string]: string | ReadonlyArray<string>};
 
   /** Encoding codec used to parse and serialize the params. */
   encoder?: HttpParameterCodec;