diff --git a/vendor/docker-nixos/build.sh b/vendor/docker-nixos/build.sh
index 364760d..cec59df 100755
--- a/vendor/docker-nixos/build.sh
+++ b/vendor/docker-nixos/build.sh
@@ -7,8 +7,7 @@ if [ -z "$NIXOS_TAG" ]; then
   exit 1
 fi
 
-docker build \
-    --cpus=$(( $(nproc) / 2 )) \
+cpulimit -l 50 docker build \
     -t "git.devcomp.xyz/devcomp/nixos:$NIXOS_TAG" \
     -f Dockerfile \
     --push .