diff --git a/rtc_base/thread.h b/rtc_base/thread.h
index 01a3917155..41052dfb1d 100644
--- a/rtc_base/thread.h
+++ b/rtc_base/thread.h
@@ -133,7 +133,7 @@ struct _SendMessage {
 
 // WARNING! SUBCLASSES MUST CALL Stop() IN THEIR DESTRUCTORS!  See ~Thread().
 
-class RTC_EXPORT RTC_LOCKABLE Thread : public MessageQueue {
+class RTC_LOCKABLE RTC_EXPORT Thread : public MessageQueue {
  public:
   explicit Thread(SocketServer* ss);
   explicit Thread(std::unique_ptr<SocketServer> ss);