diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index 53ebe63b4e..8325ba4aaf 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -195,6 +195,7 @@ if (BUILD_UNIT_TEST STREQUAL "ON")
     if (BUILD_COVERAGE STREQUAL "ON")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
     endif ()
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DELPP_DISABLE_LOGS")
     add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/unittest)
 endif ()
 
diff --git a/core/src/index/CMakeLists.txt b/core/src/index/CMakeLists.txt
index 232fa80181..84f61c9aaa 100644
--- a/core/src/index/CMakeLists.txt
+++ b/core/src/index/CMakeLists.txt
@@ -99,6 +99,7 @@ endif ()
 set(INDEX_INCLUDE_DIRS ${INDEX_INCLUDE_DIRS} PARENT_SCOPE)
 
 if (KNOWHERE_BUILD_TESTS)
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DELPP_DISABLE_LOGS")
     add_subdirectory(unittest)
 endif ()