diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 54d9325..9bc78af 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -42,4 +42,4 @@ jobs:
           echo "$(brew --prefix)/bin" >> $GITHUB_PATH
         if: matrix.os == 'macos-latest'
       - name: build all
-        run: cabal build all
+        run: cabal build all --constraint='postgresql-libpq +use-pkg-config' # https://github.com/NixOS/nixpkgs/pull/373322