fix return type of FileDescriptor.fileno

Fixes: 30a111639ce6 ("expand use of FileDescriptor and add FileDescriptorLike type alias")

1 files changed, 1 insertions, 1 deletions

diff --git a/linuxnamespaces/filedescriptor.py b/linuxnamespaces/filedescriptor.py
index d11d4d6..ea699c2 100644
--- a/linuxnamespaces/filedescriptor.py
+++ b/linuxnamespaces/filedescriptor.py
@@ -65,7 +65,7 @@ class FileDescriptor(int):
         """Convenience wrapper for os.pidfd_open."""
         return cls(os.pidfd_open(pid, flags))
 
-    def fileno(self) -> FileDescriptor:
+    def fileno(self) -> "FileDescriptor":
         """Return self such that it satisfies the HasFileno protocol."""
         return self