diff --git a/internal/core/src/index/CMakeLists.txt b/internal/core/src/index/CMakeLists.txt
index 0180bae81f..2f3d4e1663 100644
--- a/internal/core/src/index/CMakeLists.txt
+++ b/internal/core/src/index/CMakeLists.txt
@@ -93,7 +93,7 @@ endif ()
 
 set(INDEX_INCLUDE_DIRS ${INDEX_INCLUDE_DIRS} PARENT_SCOPE)
 
-if (KNOWHERE_BUILD_TESTS)
+if (BUILD_UNIT_TEST)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DELPP_DISABLE_LOGS")
     add_subdirectory(unittest)
 endif ()
diff --git a/internal/core/src/index/cmake/DefineOptionsCore.cmake b/internal/core/src/index/cmake/DefineOptionsCore.cmake
index aab4603110..5d54b41f1b 100644
--- a/internal/core/src/index/cmake/DefineOptionsCore.cmake
+++ b/internal/core/src/index/cmake/DefineOptionsCore.cmake
@@ -91,12 +91,6 @@ define_option(MILVUS_CUDA_ARCH "Build with CUDA arch" "DEFAULT")
 #----------------------------------------------------------------------
 set_option_category("Test and benchmark")
 
-if (BUILD_UNIT_TEST)
-    define_option(KNOWHERE_BUILD_TESTS "Build the KNOWHERE googletest unit tests" ON)
-else ()
-    define_option(KNOWHERE_BUILD_TESTS "Build the KNOWHERE googletest unit tests" OFF)
-endif (BUILD_UNIT_TEST)
-
 #----------------------------------------------------------------------
 macro(config_summary)
     message(STATUS "---------------------------------------------------------------------")