diff --git a/packages/angular/build/src/builders/karma/application_builder.ts b/packages/angular/build/src/builders/karma/application_builder.ts
index b504146df2a4..365d5fec8ef0 100644
--- a/packages/angular/build/src/builders/karma/application_builder.ts
+++ b/packages/angular/build/src/builders/karma/application_builder.ts
@@ -215,6 +215,8 @@ function injectKarmaReporter(
 
   class ProgressNotifierReporter {
     static $inject = ['emitter', LATEST_BUILD_FILES_TOKEN];
+    // Needed for the karma reporter interface, see https://github.com/angular/angular-cli/issues/31629
+    adapters = [];
 
     constructor(
       private readonly emitter: KarmaEmitter,