diff --git a/tests/baselines/reference/APISample_watcher.js b/tests/baselines/reference/APISample_watcher.js
index 7573f2ba99e..cb7fc3a4c5c 100644
--- a/tests/baselines/reference/APISample_watcher.js
+++ b/tests/baselines/reference/APISample_watcher.js
@@ -20,7 +20,7 @@ declare var path: any;
 import * as ts from "typescript";
 
 function watch(rootFileNames: string[], options: ts.CompilerOptions) {
-    const files: ts.Map<{ version: number }> = {};
+    const files: ts.MapLike<{ version: number }> = {};
 
     // initialize the list of files
     rootFileNames.forEach(fileName => {
diff --git a/tests/cases/compiler/APISample_watcher.ts b/tests/cases/compiler/APISample_watcher.ts
index 34baa04c850..07922bd35c7 100644
--- a/tests/cases/compiler/APISample_watcher.ts
+++ b/tests/cases/compiler/APISample_watcher.ts
@@ -23,7 +23,7 @@ declare var path: any;
 import * as ts from "typescript";
 
 function watch(rootFileNames: string[], options: ts.CompilerOptions) {
-    const files: ts.Map<{ version: number }> = {};
+    const files: ts.MapLike<{ version: number }> = {};
 
     // initialize the list of files
     rootFileNames.forEach(fileName => {