diff --git a/tests/angular_devkit/build_webpack/angular-app/tsconfig.json b/tests/angular_devkit/build_webpack/angular-app/tsconfig.json
index 31ac2a6ecc..c0c5335700 100644
--- a/tests/angular_devkit/build_webpack/angular-app/tsconfig.json
+++ b/tests/angular_devkit/build_webpack/angular-app/tsconfig.json
@@ -18,7 +18,10 @@
     ]
   },
   "angularCompilerOptions": {
-    "enableIvy": true,
+    // TODO: debug this problem.
+    // This should really be true but was getting the error below on every second build.
+    // `ERROR in Cannot read property 'incrementalState' of null`
+    "enableIvy": false,
     "disableTypeScriptVersionCheck": true
   }
 }