diff --git a/libs/pbd/file_manager.cc b/libs/pbd/file_manager.cc
index 21f005cd4f..bc3daa3547 100644
--- a/libs/pbd/file_manager.cc
+++ b/libs/pbd/file_manager.cc
@@ -201,7 +201,7 @@ FileDescriptor::release ()
 FdFileDescriptor::FdFileDescriptor (string const & file_name, bool writeable, mode_t mode)
 	: FileDescriptor (file_name, writeable)
 	, _fd (-1)
-	, _mode (m)
+	, _mode (mode)
 {
 	manager()->add (this);
 }