diff --git a/cpp/build.sh b/cpp/build.sh
index edfe9305be..ef66a0c375 100755
--- a/cpp/build.sh
+++ b/cpp/build.sh
@@ -8,7 +8,7 @@ MAKE_CLEAN="OFF"
 BUILD_COVERAGE="OFF"
 DB_PATH="/opt/milvus"
 PROFILING="OFF"
-BUILD_FAISS_WITH_MKL="OFF"
+BUILD_FAISS_WITH_MKL="ON"
 
 while getopts "p:d:t:uhlrcgm" arg
 do
diff --git a/cpp/cmake/ThirdPartyPackages.cmake b/cpp/cmake/ThirdPartyPackages.cmake
index fed5dece88..837d6bd470 100644
--- a/cpp/cmake/ThirdPartyPackages.cmake
+++ b/cpp/cmake/ThirdPartyPackages.cmake
@@ -700,7 +700,7 @@ endmacro()
 # FAISS
 
 if(NOT DEFINED BUILD_FAISS_WITH_MKL)
-    set(BUILD_FAISS_WITH_MKL OFF)
+    set(BUILD_FAISS_WITH_MKL ON)
 endif()
 
 if(EXISTS "/proc/cpuinfo")