diff --git a/src/lib/libpthread.js b/src/lib/libpthread.js
index ac112b6a6dc80..1a25733df5c69 100644
--- a/src/lib/libpthread.js
+++ b/src/lib/libpthread.js
@@ -591,17 +591,6 @@ var LibraryPThread = {
     dbg(`terminateWorker: ${worker.workerID}`);
 #endif
     worker.terminate();
-    // terminate() can be asynchronous, so in theory the worker can continue
-    // to run for some amount of time after termination.  However from our POV
-    // the worker is now dead and we don't want to hear from it again, so we stub
-    // out its message handler here.  This avoids having to check in each of
-    // the onmessage handlers if the message was coming from a valid worker.
-    worker.onmessage = (e) => {
-#if ASSERTIONS
-      var cmd = e.data.cmd;
-      err(`received "${cmd}" command from terminated worker: ${worker.workerID}`);
-#endif
-    };
   },
 
   _emscripten_thread_cleanup: (thread) => {
diff --git a/test/test_other.py b/test/test_other.py
index 0d924f90e18a6..5758d6fbb13e1 100644
--- a/test/test_other.py
+++ b/test/test_other.py
@@ -6166,10 +6166,6 @@ def test_modularize_instantiation_error(self):
 
   @crossplatform
   @requires_pthreads
-  @flaky('https://github.com/emscripten-core/emscripten/issues/19683')
-  # The flakiness of this test is very high on macOS so just disable it
-  # completely.
-  @no_mac('https://github.com/emscripten-core/emscripten/issues/19683')
   def test_pthread_print_override_modularize(self):
     self.set_setting('EXPORT_NAME', 'Test')
     self.set_setting('PROXY_TO_PTHREAD')