diff --git a/src/libfetchers/cache.cc b/src/libfetchers/cache.cc
index 2f0f7c719..bb2bd7749 100644
--- a/src/libfetchers/cache.cc
+++ b/src/libfetchers/cache.cc
@@ -130,6 +130,7 @@ struct CacheImpl : Cache
         std::string_view key,
         std::string_view value) override
     {
+        debug("upserting fact '%s' -> '%s'", key, value);
         _state.lock()->upsertFact.use()
             (key)
             (value).exec();
diff --git a/src/libfetchers/fetchers.cc b/src/libfetchers/fetchers.cc
index 33a36338c..2c958276b 100644
--- a/src/libfetchers/fetchers.cc
+++ b/src/libfetchers/fetchers.cc
@@ -162,7 +162,7 @@ std::pair<ref<InputAccessor>, Input> Input::getAccessor(ref<Store> store) const
 
     try {
         auto [accessor, final] = scheme->getAccessor(store, *this);
-        accessor->fingerprint = scheme->getFingerprint(store, *this);
+        accessor->fingerprint = scheme->getFingerprint(store, final);
         checkLocks(final);
         return {accessor, std::move(final)};
     } catch (Error & e) {