1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/fileinput.py b/Lib/fileinput.py
index b8b9870..53e7c09 100644
--- a/Lib/fileinput.py
+++ b/Lib/fileinput.py
@@ -226,7 +226,7 @@ class FileInput:
         self._mode = mode
         if inplace and openhook:
             raise ValueError("FileInput cannot use an opening hook in inplace mode")
-        elif openhook and not callable(openhook):
+        elif openhook and not hasattr(openhook, '__call__'):
             raise ValueError("FileInput openhook must be callable")
         self._openhook = openhook