diff --git a/src/mpsd_software_manager/spack.py b/src/mpsd_software_manager/spack.py
index f8bd3b9884265304a5db9c397693f58fac650088..51b3dd5a3eee01b91a7153f86d69a20066190d7c 100644
--- a/src/mpsd_software_manager/spack.py
+++ b/src/mpsd_software_manager/spack.py
@@ -425,6 +425,7 @@ def generate_meta_modules(
         "intel-oneapi-mkl",
         "cmake",
         "ninja",
+        "gsl",
     ]
 
     toolchain_pre = []  # collect packages for hierarchy: compilers and mpi