diff --git a/engine/src/flutter/build/config/ios/rules.gni b/engine/src/flutter/build/config/ios/rules.gni
index a8699ee5e61..7348a25b951 100644
--- a/engine/src/flutter/build/config/ios/rules.gni
+++ b/engine/src/flutter/build/config/ios/rules.gni
@@ -52,10 +52,11 @@ template("xcode_harness_ios") {
   xcode_project_gen_target_name = app_name + "_xcode"
   copy(xcode_project_gen_target_name) {
     sources = [
-      "//build/config/ios/XcodeHarness"
+      "//build/config/ios/XcodeHarness/FakeMain.m",
+      "//build/config/ios/XcodeHarness/Harness.xcodeproj",
     ]
     outputs = [
-      "$root_build_dir/$xcode_project_gen_target_name/Harness.xcodeproj",
+      "$root_build_dir/$xcode_project_gen_target_name/{{source_file_part}}",
     ]
   }