diff --git a/.github/workflows/ffigen_weekly.yml b/.github/workflows/ffigen_weekly.yml
index 863eac3842..57d9cc48f6 100644
--- a/.github/workflows/ffigen_weekly.yml
+++ b/.github/workflows/ffigen_weekly.yml
@@ -4,17 +4,18 @@
 name: ffigen_weekly
 
 on:
-  # Run once a week.
   push:
     branches: [main, stable]
     paths:
-      - '.github/workflows/ffigen_weekly.yml'
+      - '.github/workflows/ffigen.yml'
+      - 'pkgs/ffigen/**'
+      - 'pkgs/objective_c/**'
   pull_request:
     branches: [main, stable]
     paths:
-      - '.github/workflows/ffigen_weekly.yml'
-  schedule:
-    - cron: "0 0 * * 0"
+      - '.github/workflows/ffigen.yml'
+      - 'pkgs/ffigen/**'
+      - 'pkgs/objective_c/**'
 
 env:
   PUB_ENVIRONMENT: bot.github
diff --git a/pkgs/ffigen/test/native_objc_test/setup.dart b/pkgs/ffigen/test/native_objc_test/setup.dart
index aad2ebcfbb..f7f41205c6 100644
--- a/pkgs/ffigen/test/native_objc_test/setup.dart
+++ b/pkgs/ffigen/test/native_objc_test/setup.dart
@@ -13,7 +13,7 @@ const arcDisabledFiles = <String>{
 };
 
 Future<void> _runClang(List<String> flags, String output) async {
-  final args = [...flags, '-o', output];
+  final args = [...flags, '-Ofast', '-o', output];
   final process = await Process.start('clang', args);
   unawaited(stdout.addStream(process.stdout));
   unawaited(stderr.addStream(process.stderr));
diff --git a/pkgs/objective_c/test/setup.dart b/pkgs/objective_c/test/setup.dart
index e78993627b..982264d6fa 100644
--- a/pkgs/objective_c/test/setup.dart
+++ b/pkgs/objective_c/test/setup.dart
@@ -49,6 +49,7 @@ String _resolve(String file) => _pkgDir.resolve(file).toFilePath();
 void _runClang(List<String> flags, String output) {
   final args = [
     ...flags,
+    '-Ofast',
     '-o',
     output,
   ];