diff --git a/post_proc/Android.mk b/post_proc/Android.mk
index d9b367f..637a1f3 100644
--- a/post_proc/Android.mk
+++ b/post_proc/Android.mk
@@ -49,6 +49,10 @@
     LOCAL_STATIC_LIBRARIES += libprofile_rt
 endif
 
+ifeq ($(strip $(AUDIO_FEATURE_ENABLED_INSTANCE_ID)), true)
+    LOCAL_CFLAGS += -DINSTANCE_ID_ENABLED
+endif
+
 LOCAL_CFLAGS+= -O2 -fvisibility=hidden
 
 ifneq ($(strip $(AUDIO_FEATURE_DISABLED_DTS_EAGLE)),true)