diff --git a/tools/tests/old/test-bundler-assets.js b/tools/tests/old/test-bundler-assets.js
index c0c1278434..6f7479f7bc 100644
--- a/tools/tests/old/test-bundler-assets.js
+++ b/tools/tests/old/test-bundler-assets.js
@@ -172,6 +172,13 @@ makeGlobalAsyncLocalStorage().run(
 
     // Allow the process to exit normally, since optimistic file watchers
     // may be keeping the event loop busy.
-    safeWatcher.closeAllWatchers();
+    safeWatcher.closeAllWatchers()
+      .then(() => {
+        process.exit(0);
+      })
+      .catch(err => {
+        console.error(`Error closing watchers:`, err);
+        process.exit(1);
+      });
   }
 );
diff --git a/tools/tests/old/test-bundler-options.js b/tools/tests/old/test-bundler-options.js
index 2bf8d00aa1..871146afb6 100644
--- a/tools/tests/old/test-bundler-options.js
+++ b/tools/tests/old/test-bundler-options.js
@@ -200,6 +200,13 @@ makeGlobalAsyncLocalStorage().run(
 
     // Allow the process to exit normally, since optimistic file watchers
     // may be keeping the event loop busy.
-    safeWatcher.closeAllWatchers();
+    safeWatcher.closeAllWatchers()
+      .then(() => {
+        process.exit(0);
+      })
+      .catch(err => {
+        console.error(`Error closing watchers:`, err);
+        process.exit(1);
+      });
   }
 );