diff --git a/.github/workflows/install_spack.sh b/.github/workflows/install_spack.sh
index aa8a68adc1d..5efae461a53 100755
--- a/.github/workflows/install_spack.sh
+++ b/.github/workflows/install_spack.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env sh
 git clone https://github.com/spack/spack.git
+echo -e "config:\n  build_jobs: 2" > spack/etc/spack/config.yaml
 . spack/share/spack/setup-env.sh
 spack compilers