diff --git a/src/fuse_open.cpp b/src/fuse_open.cpp
index e48f3a9e..b3069810 100644
--- a/src/fuse_open.cpp
+++ b/src/fuse_open.cpp
@@ -38,6 +38,8 @@
 
 struct PT
 {
+  PT(int x) { backing_id = x }
+    
   int backing_id;
   std::mutex mutex;
 };