diff --git a/src/fuse_open.cpp b/src/fuse_open.cpp
index 22ba7af2..d28a6450 100644
--- a/src/fuse_open.cpp
+++ b/src/fuse_open.cpp
@@ -335,7 +335,7 @@ namespace FUSE
   open(const char       *fusepath_,
        fuse_file_info_t *ffi_)
   {
-    pt.emplace_or_visit(0,std::mutex{},
+    pt.emplace_or_visit(0,
                         [](const PTMap::value_type &x_)
                         {