diff --git a/aichallenge/workspace/colcon_build.bash b/aichallenge/workspace/colcon_build.bash
index a525777f..c9991efd 100755
--- a/aichallenge/workspace/colcon_build.bash
+++ b/aichallenge/workspace/colcon_build.bash
@@ -1,2 +1,2 @@
 #!/usr/bin/bash
-colcon build --symlink-install --packages-up-to aichallenge_launch --executor sequential
+MAKEFLAGS=-j4 colcon build --symlink-install --packages-up-to aichallenge_launch --executor sequential