--- a/media/mtransport/nr_socket_prsock.cpp
+++ b/media/mtransport/nr_socket_prsock.cpp
@@ -207,20 +207,19 @@ public:
    */
   MozExternalRefCountType AddUse()
   {
     MOZ_ASSERT(mParentThread == NS_GetCurrentThread());
     MOZ_ASSERT(int32_t(mUseCount) >= 0, "illegal refcnt");
     nsrefcnt count = ++mUseCount;
     if (count == 1) {
       // idle -> in-use
-      nsresult rv = NS_NewThread(getter_AddRefs(mThread));
+      nsresult rv = NS_NewNamedThread(mName, getter_AddRefs(mThread));
       MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv) && mThread,
                          "Should successfully create mtransport I/O thread");
-      NS_SetThreadName(mThread, mName);
       r_log(LOG_GENERIC,LOG_DEBUG,"Created wrapped SingletonThread %p",
             mThread.get());
     }
     r_log(LOG_GENERIC,LOG_DEBUG,"AddUse: %lu", (unsigned long) count);
     return count;
   }
 
   MozExternalRefCountType ReleaseUse()