diff --git a/src/proxy/FetchSM.cc b/src/proxy/FetchSM.cc
index 66b800fd6a7..11fef0f8494 100644
--- a/src/proxy/FetchSM.cc
+++ b/src/proxy/FetchSM.cc
@@ -61,6 +61,7 @@ FetchSM::cleanUp()
   }
 
   if (http_vc) {
+    http_vc->do_io_shutdown(IO_SHUTDOWN_READWRITE);
     http_vc->do_io_close();
   }
   free_MIOBuffer(req_buffer);
diff --git a/src/proxy/PluginVC.cc b/src/proxy/PluginVC.cc
index ab9d684aa6a..3caa8dc673f 100644
--- a/src/proxy/PluginVC.cc
+++ b/src/proxy/PluginVC.cc
@@ -397,6 +397,8 @@ PluginVC::do_io_shutdown(ShutdownHowTo_t howto)
   ink_assert(!closed);
   ink_assert(magic == PluginVCMagic_t::ALIVE);
 
+  SCOPED_MUTEX_LOCK(lock, mutex, this_ethread());
+
   switch (howto) {
   case IO_SHUTDOWN_READ:
     read_state.shutdown = true;