diff --git a/src/libstore/local-overlay-store.hh b/src/libstore/local-overlay-store.hh
index e3fda2f93..12e49e6d2 100644
--- a/src/libstore/local-overlay-store.hh
+++ b/src/libstore/local-overlay-store.hh
@@ -7,9 +7,6 @@ namespace nix {
  */
 struct LocalOverlayStoreConfig : virtual LocalStoreConfig
 {
-    // FIXME why doesn't this work?
-    // using LocalStoreConfig::LocalStoreConfig;
-
     LocalOverlayStoreConfig(const StringMap & params)
         : StoreConfig(params)
         , LocalFSStoreConfig(params)