diff --git a/ci/scripts/build.sh b/ci/scripts/build.sh
index 0ac615891e665ff9cb64678516ec5c8ef6e24ca3..30ea8249d935ead71ebcee9f108398f462a48d97 100755
--- a/ci/scripts/build.sh
+++ b/ci/scripts/build.sh
@@ -144,7 +144,7 @@ if [[ ${RUN_CPPLINT} == "ON" ]]; then
 fi
 
 # compile and build
-make -j8 || exit 1
+make -j6 || exit 1
 
 if [[ ${PRIVILEGES} == "ON" ]];then
     sudo make install || exit 1