counter implementation
diff --git a/btcore/Android.mk b/btcore/Android.mk
index 6519374..8426bc0 100644
--- a/btcore/Android.mk
+++ b/btcore/Android.mk
@@ -26,6 +26,7 @@
 
 LOCAL_SRC_FILES := \
     src/bdaddr.c \
+    src/counter.c \
     src/module.c \
     src/property.c \
     src/uuid.c