diff --git a/docker_vars.sh b/docker_vars.sh
index 5a096a1..55e3fb6 100644
--- a/docker_vars.sh
+++ b/docker_vars.sh
@@ -1 +1,2 @@
 docker_src=/devel/docker
+build_threads=24
diff --git a/openwrt/Makefile b/openwrt/Makefile
index aa4fedf..3f37b71 100644
--- a/openwrt/Makefile
+++ b/openwrt/Makefile
@@ -39,7 +39,7 @@ output: ${docker_src}/built/openwrt-builder-master.sentinel $(BASE_REQS)
 		-v $$PWD/input:/input \
 		-v $$PWD/input.sh:/input.sh \
 		-v $$PWD/output.sh:/output.sh \
-		--rm -it openwrt-builder-master make V=ssc -j24 build
+		--rm -it openwrt-builder-master make V=ssc -j ${build_threads}
 
 output-%: ${docker_src}/built/openwrt-builder-%.sentinel $(BASE_REQS)
 	docker run \
@@ -47,7 +47,7 @@ output-%: ${docker_src}/built/openwrt-builder-%.sentinel $(BASE_REQS)
 		-v $$PWD/input:/input \
 		-v $$PWD/input.sh:/input.sh \
 		-v $$PWD/output.sh:/output.sh \
-		--rm -it openwrt-builder-$* make V=ssc -j24
+		--rm -it openwrt-builder-$* make V=ssc -j ${build_threads}
 
 debug-%: ${docker_src}/built/openwrt-builder-%.sentinel $(BASE_REQS)
 	docker run \