diff --git a/lix/libstore/binary-cache-store.cc b/lix/libstore/binary-cache-store.cc
index 3af54d4d9..609dc962a 100644
--- a/lix/libstore/binary-cache-store.cc
+++ b/lix/libstore/binary-cache-store.cc
@@ -65,13 +65,6 @@ void BinaryCacheStore::upsertFile(const std::string & path,
     upsertFile(path, std::make_shared<std::stringstream>(std::move(data)), mimeType);
 }
 
-box_ptr<Source> BinaryCacheStore::getFile(const std::string & path)
-{
-    return make_box_ptr<GeneratorSource>([](std::string data) -> Generator<Bytes> {
-        co_yield std::span{data.data(), data.size()};
-    }(std::move(*getFileContents(path))));
-}
-
 std::optional<std::string> BinaryCacheStore::getFileContents(const std::string & path)
 {
     StringSink sink;
diff --git a/lix/libstore/binary-cache-store.hh b/lix/libstore/binary-cache-store.hh
index 538da50b6..a8a393133 100644
--- a/lix/libstore/binary-cache-store.hh
+++ b/lix/libstore/binary-cache-store.hh
@@ -85,7 +85,7 @@ public:
     /**
      * Dump the contents of the specified file to a sink.
      */
-    virtual box_ptr<Source> getFile(const std::string & path);
+    virtual box_ptr<Source> getFile(const std::string & path) = 0;
 
     virtual std::optional<std::string> getFileContents(const std::string & path);