diff --git a/src/libutil/archive.hh b/src/libutil/archive.hh
index fe22435ef..9e9e11b1a 100644
--- a/src/libutil/archive.hh
+++ b/src/libutil/archive.hh
@@ -82,7 +82,7 @@ struct RetrieveRegularNARSink : ParseSink
         sink(data);
     }
 
-    void createSymlink(const Path & path, const string & target)
+    void createSymlink(const Path & path, const string & target) override
     {
         regular = false;
     }