diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3d0e4ab..bd8b9d8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -81,8 +81,8 @@ jobs:
           cat .gitignore_extra >> .gitignore
           pip install numpy==${{matrix.numpy-version}} build==1.2.2.post1 ninja meson
           cd src/pyraingen/fortran_daily
-          set FC=gfortran
-          set CC=msvc
+          $env:FC = 'gfortran'
+          $env:CC = 'cl'
           python -m numpy.f2py -c regionalised_dailyT4.for -m regionalised_dailyT4 -I $PWD --fcompiler=gfortran --compiler=msvc --backend meson
           Get-ChildItem -Force -R
           cd ../../..