diff --git a/.github/workflows/spack_build.yml b/.github/workflows/spack_build.yml
index 00c5f817..c43458b5 100644
--- a/.github/workflows/spack_build.yml
+++ b/.github/workflows/spack_build.yml
@@ -133,7 +133,7 @@ jobs:
             - openblas
             - libevent~openssl
             concretizer:
-              reuse: false
+              reuse: true
               unify: true
             config:
               source_cache: $SPACK_CACHE/source_cache