diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 49d8c53..989d86b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -43,7 +43,7 @@ jobs:
         if: matrix.os == 'macos-latest'
         run: |
           brew install fftw
-          CFLAGS=" -L/opt/homebrew/lib " python -m pip install spinsfast
+          CFLAGS="-I/opt/homebrew/include" LDFLAGS="-L/opt/homebrew/lib" python -m pip install --no-binary :all: spinsfast
 
       - name: Install pipenv
         shell: bash -l {0}