diff --git a/webrtc/system_wrappers/interface/clock.h b/webrtc/system_wrappers/interface/clock.h
index 2bb6c108f3..ed65006c05 100644
--- a/webrtc/system_wrappers/interface/clock.h
+++ b/webrtc/system_wrappers/interface/clock.h
@@ -13,7 +13,6 @@
 
 #include "webrtc/system_wrappers/interface/rw_lock_wrapper.h"
 #include "webrtc/system_wrappers/interface/scoped_ptr.h"
-#include "webrtc/system_wrappers/interface/thread_annotations.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
@@ -77,7 +76,7 @@ class SimulatedClock : public Clock {
   void AdvanceTimeMicroseconds(int64_t microseconds);
 
  private:
-  int64_t time_us_ GUARDED_BY(lock_);
+  int64_t time_us_;
   scoped_ptr<RWLockWrapper> lock_;
 };