diff --git a/build_action.sh b/build_action.sh
index 7519f42..c32c77b 100644
--- a/build_action.sh
+++ b/build_action.sh
@@ -26,7 +26,7 @@ cp ../config .config
 source ../patch.d/*.sh
 
 # build deb packages
-CPU_CORES=$(grep -c processor < /proc/cpuinfo)
+CPU_CORES=$(($(grep -c processor < /proc/cpuinfo)*2))
 make deb-pkg -j"$CPU_CORES"
 
 # move deb packages to artifact dir