diff --git a/cpp/build.sh b/cpp/build.sh
index a4b7080ee34b59bce6ae39d5b19ecc6167fa0b01..104ecc89d3d8c85f352d550de3048cf739a775b3 100755
--- a/cpp/build.sh
+++ b/cpp/build.sh
@@ -13,7 +13,7 @@ USE_JFROG_CACHE="OFF"
 KNOWHERE_OPTS=""
 KNOWHERE_BUILD_DIR="`pwd`/thirdparty/knowhere/knowhere"
 
-while getopts "p:d:t:uhlrcgkmj" arg
+while getopts "p:d:t:k:uhlrcgmj" arg
 do
         case $arg in
              t)