diff --git a/core/src/index/cmake/ThirdPartyPackagesCore.cmake b/core/src/index/cmake/ThirdPartyPackagesCore.cmake
index 1a22a9d2be..fb698cdf13 100644
--- a/core/src/index/cmake/ThirdPartyPackagesCore.cmake
+++ b/core/src/index/cmake/ThirdPartyPackagesCore.cmake
@@ -708,7 +708,7 @@ macro(build_faiss)
     set(FAISS_CONFIGURE_ARGS
             "--prefix=${FAISS_PREFIX}"
             "CFLAGS=${EP_C_FLAGS}"
-            "CXXFLAGS=${EP_CXX_FLAGS}"
+            "CXXFLAGS=${EP_CXX_FLAGS} -mavx2 -mf16c"
             --without-python)
 
     if (FAISS_WITH_MKL)