diff --git a/packages/language-service/test/test_utils.ts b/packages/language-service/test/test_utils.ts
index fb7511568f..53508169a2 100644
--- a/packages/language-service/test/test_utils.ts
+++ b/packages/language-service/test/test_utils.ts
@@ -66,8 +66,7 @@ missingCache.set('/node_modules/@angular/forms/src/directives/form_interface.met
 
 export class MockTypescriptHost implements ts.LanguageServiceHost {
   private angularPath: string|undefined;
-  // TODO(issue/24571): remove '!'.
-  private nodeModulesPath !: string;
+  private nodeModulesPath: string;
   private scriptVersion = new Map<string, number>();
   private overrides = new Map<string, string>();
   private projectVersion = 0;