diff --git a/common.sh b/common.sh
index 19da13b..0a97741 100755
--- a/common.sh
+++ b/common.sh
@@ -257,8 +257,7 @@ function build_in_chroot(){
 	work_dir=$1
 	into_build_dir=$2
 	user_name=$3
-	cpus=`cat /proc/cpuinfo| grep "processor"| wc -l`
 	sudo chroot $work_dir /bin/bash -c "useradd -d /build $user_name"
 	sudo chroot $work_dir /bin/bash -c "chown -R $user_name /build"
-	sudo chroot $work_dir su - $user_name -c "cd /build/$into_build_dir && dpkg-buildpackage -j$cpus && exit"
+	sudo chroot $work_dir su - $user_name -c "cd /build/$into_build_dir && dpkg-buildpackage -j4 && exit"
 }