diff --git a/core/unittest/CMakeLists.txt b/core/unittest/CMakeLists.txt
index 62b5bdf256..361735ad2c 100644
--- a/core/unittest/CMakeLists.txt
+++ b/core/unittest/CMakeLists.txt
@@ -80,6 +80,7 @@ set(helper_files
         ${MILVUS_ENGINE_SRC}/utils/CommonUtil.cpp
         ${MILVUS_ENGINE_SRC}/utils/TimeRecorder.cpp
         ${MILVUS_ENGINE_SRC}/utils/Status.cpp
+        ${MILVUS_ENGINE_SRC}/utils/StringHelpFunctions.cpp
         ${MILVUS_ENGINE_SRC}/utils/ValidationUtil.cpp
         ${MILVUS_ENGINE_SRC}/external/easyloggingpp/easylogging++.cc
         )