diff --git a/.github/workflows/test_and_coverage.yml b/.github/workflows/test_and_coverage.yml
index b053d7a8..a159e5fb 100644
--- a/.github/workflows/test_and_coverage.yml
+++ b/.github/workflows/test_and_coverage.yml
@@ -27,7 +27,7 @@ jobs:
           curl -LsSf https://github.com/taiki-e/cargo-llvm-cov/releases/latest/download/cargo-llvm-cov-x86_64-unknown-linux-gnu.tar.gz | tar xzf - -C ~/.cargo/bin
       - name: Generate code coverage
         run: |
-          cargo llvm-cov --workspace --ignore-filename-regex 'build.rs|mem_check.rs|mem_check_lab.rs|solve_matrix_market.rs|amplifier1t.rs|brusselator_pde.rs' --lcov --output-path lcov.info
+          cargo llvm-cov --workspace --features with_mumps --ignore-filename-regex 'build.rs|mem_check.rs|mem_check_lab.rs|solve_matrix_market.rs|amplifier1t.rs|brusselator_pde.rs' --lcov --output-path lcov.info
       - name: Upload to codecov.io
         uses: codecov/codecov-action@v4
         with: