diff --git a/services/audiopolicy/AudioPolicyInterface.h b/services/audiopolicy/AudioPolicyInterface.h
index 49937f0..30f29d6 100644
--- a/services/audiopolicy/AudioPolicyInterface.h
+++ b/services/audiopolicy/AudioPolicyInterface.h
@@ -258,7 +258,7 @@
     virtual status_t getHwOffloadEncodingFormatsSupportedForA2DP(
                 std::vector<audio_format_t> *formats) = 0;
 
-    virtual void     setAppState(uid_t uid, app_state_t state);
+    virtual void     setAppState(uid_t uid, app_state_t state) = 0;
 
     virtual status_t listAudioProductStrategies(AudioProductStrategyVector &strategies) = 0;