diff --git a/common/slurm.nix b/common/slurm.nix
index 672bfc5..c1b09d6 100644
--- a/common/slurm.nix
+++ b/common/slurm.nix
@@ -8,5 +8,8 @@
     nodeName = [
       "xeon[01-02,07]  Sockets=2 CoresPerSocket=14 ThreadsPerCore=2 Feature=xeon"
     ];
+    extraConfig = ''
+      MpiDefault=pmix
+    '';
   };
 }