diff --git a/src/fuse_open.cpp b/src/fuse_open.cpp
index 0ce89d53..3bc13fc3 100644
--- a/src/fuse_open.cpp
+++ b/src/fuse_open.cpp
@@ -336,7 +336,10 @@ namespace FUSE
        fuse_file_info_t *ffi_)
   {
     pt.try_emplace_or_visit(fusepath_,
-                            [](const std::pair<std::string,PT>
+                            [](const PTMap::value_type &x_)
+                            {
+
+                            });