diff --git a/src/libstore/dummy-store.cc b/src/libstore/dummy-store.cc
index 2909d20e0..1cd1fd08c 100644
--- a/src/libstore/dummy-store.cc
+++ b/src/libstore/dummy-store.cc
@@ -26,6 +26,7 @@ struct DummyStore : virtual Store
         , config(config)
         , contents(make_ref<MemorySourceAccessor>())
     {
+        contents->setPathDisplay(config->storeDir);
     }
 
     void queryPathInfoUncached(