diff --git a/src/func_create_base.hpp b/src/func_create_base.hpp
index 2359959b..a8c962bb 100644
--- a/src/func_create_base.hpp
+++ b/src/func_create_base.hpp
@@ -38,6 +38,6 @@ namespace Func
     virtual int operator()(Branches2        &branches,
                            fs::Path const   &fusepath,
                            mode_t const      mode,
-                           fuse_file_info_t *ffi)
+                           fuse_file_info_t *ffi) = 0;
   };
 }