diff --git a/.forgejo/workflows/check.yml b/.forgejo/workflows/check.yml
index f18c8bd..fc58396 100644
--- a/.forgejo/workflows/check.yml
+++ b/.forgejo/workflows/check.yml
@@ -58,4 +58,13 @@ jobs:
             nix --print-build-logs --verbose --accept-flake-config --access-tokens '' \
               build --out-link ./result-$target ".#nixosConfigurations.${target}.config.system.build.toplevel"
           done
+
           nix --print-build-logs --verbose --accept-flake-config --access-tokens '' flake check
+
+          # Add GC roots for flake inputs, too
+          # https://github.com/NixOS/nix/issues/4250#issuecomment-1146878407
+          gc_root_prefix="/nix/var/nix/profiles/per-user/$USER/infra-flake-"
+          echo "Adding gcroots flake inputs..."
+          nix flake archive --json 2>/dev/null | jq -r '.inputs | to_entries[] | "ln -fsT "+.value.path+" \"'"$gc_root_prefix"'"+.key+"\""' | while read -r line; do
+            eval "$line"
+          done