diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 19bdc966..92dd0b45 100755
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -31,6 +31,12 @@ jobs:
     steps:
       - name: Clone project
         uses: actions/checkout@v2
+      - name: Install LLVM 12
+        run: |
+          brew install llvm@12
+          echo "$(brew --prefix)/opt/llvm/bin"                >> "${GITHUB_PATH}"
+          echo LDFLAGS="-L$(brew --prefix)/opt/llvm/lib"      >> "${GITHUB_ENV}"
+          echo CPPFLAGS="-I$(brew --prefix)/opt/llvm/include" >> "${GITHUB_ENV}"
       - name: Setup Haskell
         uses: haskell-actions/setup@v2.7.5
         with: