diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index a0e0ea5..1c44f2f 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -965,6 +965,8 @@
 
                     // return estimated latency in milliseconds, as reported by HAL
                     uint32_t    latency() const;
+                    // same, but lock must already be held
+                    uint32_t    latency_l() const;
 
                     void        setMasterVolume(float value);
                     void        setMasterMute(bool muted);