diff --git a/gunicorn/util.py b/gunicorn/util.py
index 9ef79a3a..b7d3a67a 100644
--- a/gunicorn/util.py
+++ b/gunicorn/util.py
@@ -515,7 +515,7 @@ def is_fileobject(obj):
     # check BytesIO case and maybe others
     try:
         obj.fileno()
-    except io.UnsupportedOperation:
+    except (IOError, io.UnsupportedOperation):
         return False
 
     return True