diff --git a/engine/src/flutter/testing/run_tests.py b/engine/src/flutter/testing/run_tests.py
index 22c2672029..a51e063eb8 100755
--- a/engine/src/flutter/testing/run_tests.py
+++ b/engine/src/flutter/testing/run_tests.py
@@ -959,7 +959,7 @@ def uses_package_test_runner(package):
 #
 # The second element of each tuple is a list of additional command line
 # arguments to pass to each of the packages tests.
-def build_dart_host_test_list(build_dir):
+def build_dart_host_test_list():
   dart_host_tests = [
       os.path.join('flutter', 'ci'),
       os.path.join('flutter', 'flutter_frontend_server'),
@@ -1326,7 +1326,7 @@ Flutter Wiki page on the subject: https://github.com/flutter/flutter/wiki/Testin
 
   if 'dart-host' in types:
     dart_filter = args.dart_host_filter.split(',') if args.dart_host_filter else None
-    dart_host_packages = build_dart_host_test_list(build_dir)
+    dart_host_packages = build_dart_host_test_list()
     tasks = []
     for dart_host_package in dart_host_packages:
       if dart_filter is None or dart_host_package in dart_filter: