diff --git a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
index 1e63a05..2f7b1fb 100644
--- a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
+++ b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
@@ -693,6 +693,7 @@
                                        audio_io_handle_t *ioHandle,
                                        audio_devices_t *device)
 {
+    Mutex::Autolock _l(mLock);
     if (mAudioPolicyManager == NULL) {
         return NO_INIT;
     }
@@ -702,6 +703,7 @@
 
 status_t AudioPolicyService::releaseSoundTriggerSession(audio_session_t session)
 {
+    Mutex::Autolock _l(mLock);
     if (mAudioPolicyManager == NULL) {
         return NO_INIT;
     }