diff --git a/.github/workflows/build-and-test-dispatch.yml b/.github/workflows/build-and-test-dispatch.yml
index f466a862..5b9961b3 100644
--- a/.github/workflows/build-and-test-dispatch.yml
+++ b/.github/workflows/build-and-test-dispatch.yml
@@ -31,7 +31,7 @@ jobs:
       matrix:
         mfem-branch: [master, default] # 'default' uses a specific commit hash defined in setup.py:repos_sha
         python-version: ['3.7', '3.8', '3.9', '3.10', '3.11'] # 3.12 is not supported by scipy
-        parallel: false
+        parallel: [false]
     name: test-linux | ${{ matrix.mfem-branch }} | ${{ matrix.python-version }} | ${{ matrix.parallel && 'parallel' || 'serial' }}
     uses: ./.github/workflows/build-and-test-callable.yml
     with:
@@ -47,7 +47,7 @@ jobs:
       matrix:
         mfem-branch: [master, default] # 'default' uses a specific commit hash defined in setup.py:repos_sha
         python-version: ['3.9', '3.10', '3.11'] # 3.12 is not supported by scipy
-        parallel: true
+        parallel: [true]
     name: test-linux | ${{ matrix.mfem-branch }} | ${{ matrix.python-version }} | ${{ matrix.parallel && 'parallel' || 'serial' }}
     uses: ./.github/workflows/build-and-test-callable.yml
     with: