diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cc7d069b89..f9a0cef30a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -87,7 +87,7 @@ jobs:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
           allow-prerelease-opam: true
           dune-cache: true
-          opam-pin :
+          opam-pin: false
           opam-repositories: |
             hhugo: git+https://github.com/hhugo/opam-repository.git#gmp-mingw
             default: git+https://github.com/ocaml/opam-repository.git