diff --git a/build_tools/fbcode_config.sh b/build_tools/fbcode_config.sh
index b8609a11c..c0700e14a 100644
--- a/build_tools/fbcode_config.sh
+++ b/build_tools/fbcode_config.sh
@@ -82,7 +82,7 @@ fi
 CFLAGS+=" -DTBB"
 
 # use Intel SSE support for checksum calculations
-export USE_SSE=1
+export USE_SSE=" -msse -msse4.2 "
 
 BINUTILS="$BINUTILS_BASE/bin"
 AR="$BINUTILS/ar"