diff --git a/uisimulator/common/stubs.c b/uisimulator/common/stubs.c
index caf9dbc3be..c43fb5f1f2 100644
--- a/uisimulator/common/stubs.c
+++ b/uisimulator/common/stubs.c
@@ -274,7 +274,7 @@ int talk_spell(char* spell, bool enqueue)
     return 0;
 }
 
-const char* const dir_thumbnail_name = ".dirname.tbx";
+const char* const dir_thumbnail_name = "_dirname.talk";
 const char* const file_thumbnail_ext = ".talk";
 
 /* FIXME: this shoudn't be a stub, rather the real thing.