diff --git a/services/oboeservice/AAudioServiceStreamMMAP.h b/services/oboeservice/AAudioServiceStreamMMAP.h
index db3c8d0..42032d7 100644
--- a/services/oboeservice/AAudioServiceStreamMMAP.h
+++ b/services/oboeservice/AAudioServiceStreamMMAP.h
@@ -49,7 +49,8 @@
                             bool inService);
     ~AAudioServiceStreamMMAP() override = default;
 
-    aaudio_result_t open(const aaudio::AAudioStreamRequest &request) override;
+    aaudio_result_t open(const aaudio::AAudioStreamRequest &request) override
+            EXCLUDES(mUpMessageQueueLock);
 
     aaudio_result_t startClient(const android::AudioClient& client,
                                 const audio_attributes_t *attr,