diff --git a/docs/features/autoupdater.rst b/docs/features/autoupdater.rst
index b89a1ebe..7cfd0f21 100644
--- a/docs/features/autoupdater.rst
+++ b/docs/features/autoupdater.rst
@@ -28,7 +28,7 @@ A fully automated nightly build could use the following commands:
     (cd site && git pull)
     make update
     make clean
-    NUM_CORES_PLUS_ONE=$(expr $(lscpu|grep -e '^CPU(s):'|xargs|cut -d" " -f2) + 1)
+    NUM_CORES_PLUS_ONE=$(expr $(nproc) + 1)
     make -j$NUM_CORES_PLUS_ONE GLUON_TARGET=ar71xx-generic GLUON_BRANCH=experimental
     make manifest GLUON_BRANCH=experimental
     contrib/sign.sh $SECRETKEY output/images/sysupgrade/experimental.manifest