diff --git a/libwvdrmengine/cdm/include/wv_content_decryption_module.h b/libwvdrmengine/cdm/include/wv_content_decryption_module.h
index 42744209..aaf1558b 100644
--- a/libwvdrmengine/cdm/include/wv_content_decryption_module.h
+++ b/libwvdrmengine/cdm/include/wv_content_decryption_module.h
@@ -121,6 +121,7 @@ class WvContentDecryptionModule : public TimerHandler {
   void OnTimerEvent();
 
   static Lock session_sharing_id_generation_lock_;
+  Lock policy_timer_lock_;
   Timer policy_timer_;
 
   // instance variables
diff --git a/libwvdrmengine/cdm/src/wv_content_decryption_module.cpp b/libwvdrmengine/cdm/src/wv_content_decryption_module.cpp
index b59c6154..e247b823 100644
--- a/libwvdrmengine/cdm/src/wv_content_decryption_module.cpp
+++ b/libwvdrmengine/cdm/src/wv_content_decryption_module.cpp
@@ -2,8 +2,6 @@
 
 #include "wv_content_decryption_module.h"
 
-#include <iostream>
-
 #include "cdm_client_property_set.h"
 #include "cdm_engine.h"
 #include "initialization_data.h"
@@ -214,11 +212,13 @@ void WvContentDecryptionModule::NotifyResolution(const CdmSessionId& session_id,
 }
 
 void WvContentDecryptionModule::EnablePolicyTimer() {
+  AutoLock auto_lock(policy_timer_lock_);
   if (!policy_timer_.IsRunning())
     policy_timer_.Start(this, kCdmPolicyTimerDurationSeconds);
 }
 
 void WvContentDecryptionModule::DisablePolicyTimer(bool force) {
+  AutoLock auto_lock(policy_timer_lock_);
   if ((cdm_engine_->SessionSize() == 0 || force) && policy_timer_.IsRunning())
     policy_timer_.Stop();
 }
@@ -232,6 +232,4 @@ uint32_t WvContentDecryptionModule::GenerateSessionSharingId() {
   return ++next_session_sharing_id;
 }
 
-
-
 }  // namespace wvcdm