diff --git a/build.sh b/build.sh
index aec80f3..048f657 100644
--- a/build.sh
+++ b/build.sh
@@ -9,7 +9,7 @@ git clone https://github.com/JGRennison/OpenTTD-patches.git -b "$tag" /build/jgr
 mkdir /build/jgrpp/release
 cd /build/jgrpp/release
 cmake -DCMAKE_INSTALL_PREFIX=/opt/openttd/server -DOPTION_DEDICATED=ON -DCMAKE_BUILD_TYPE=RelWithDebInfo ..
-make
+make -j4
 mkdir -p /opt/openttd
 make install
 cd /opt/openttd