diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index 42275d4..8bd996f 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -59,6 +59,7 @@
     correction.cpp \
     dictionary.cpp \
     dic_traverse_wrapper.cpp \
+    digraph_utils.cpp \
     proximity_info.cpp \
     proximity_info_params.cpp \
     proximity_info_state.cpp \