diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b0155265..897ade21 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -165,6 +165,9 @@ jobs:
         run: |
           python3 -m venv venv
           cat venv/bin/activate >> env.source
+          : # OpenMPI needs access to a temporary directory
+          mkdir ~/tempdir
+          cat "export TMPDIR=~/tempdir"
           source env.source
 
       - name: Install Pip dependencies (MacOS)