diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index cde5d3f90e..d2092eb018 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -125,10 +125,6 @@ set(MILVUS_SOURCE_DIR ${PROJECT_SOURCE_DIR})
 set(MILVUS_BINARY_DIR ${PROJECT_BINARY_DIR})
 set(MILVUS_ENGINE_SRC ${PROJECT_SOURCE_DIR}/src)
 
-if (CUSTOMIZATION)
-    add_definitions(-DCUSTOMIZATION)
-endif (CUSTOMIZATION)
-
 include(ExternalProject)
 include(DefineOptions)
 include(BuildUtils)
diff --git a/core/src/CMakeLists.txt b/core/src/CMakeLists.txt
index b119a517d1..eda89ae93d 100644
--- a/core/src/CMakeLists.txt
+++ b/core/src/CMakeLists.txt
@@ -26,6 +26,11 @@ include_directories(${MILVUS_ENGINE_SRC}/grpc/gen-milvus)
 
 #this statement must put here, since the CORE_INCLUDE_DIRS is defined in code/CMakeList.txt
 add_subdirectory(index)
+
+if (CUSTOMIZATION)
+    add_definitions(-DCUSTOMIZATION)
+endif (CUSTOMIZATION)
+
 set(CORE_INCLUDE_DIRS ${CORE_INCLUDE_DIRS} PARENT_SCOPE)
 foreach (dir ${CORE_INCLUDE_DIRS})
     include_directories(${dir})
diff --git a/core/src/index/cmake/ThirdPartyPackagesCore.cmake b/core/src/index/cmake/ThirdPartyPackagesCore.cmake
index 4c233125bc..a7d9b9302f 100644
--- a/core/src/index/cmake/ThirdPartyPackagesCore.cmake
+++ b/core/src/index/cmake/ThirdPartyPackagesCore.cmake
@@ -244,6 +244,7 @@ if(CUSTOMIZATION)
     message(STATUS "Check the remote cache file ${FAISS_SOURCE_URL}. return code = ${return_code}")
     if (NOT return_code EQUAL 0)
         set(FAISS_SOURCE_URL "https://github.com/facebookresearch/faiss/archive/v1.5.3.tar.gz")
+        set(CUSTOMIZATION FALSE PARENT_SCOPE)
     endif()
 else()
     set(FAISS_SOURCE_URL "https://github.com/facebookresearch/faiss/archive/v1.5.3.tar.gz")