diff --git a/gunicorn/http/wsgi.py b/gunicorn/http/wsgi.py
index 00b8f74fe8..6ca3b4fb7b 100644
--- a/gunicorn/http/wsgi.py
+++ b/gunicorn/http/wsgi.py
@@ -353,7 +353,7 @@ def sendfile(self, respiter):
         if self.cfg.is_ssl or not self.can_sendfile():
             return False
 
-        if not util.is_fileobject(respiter.filelike):
+        if not util.has_fileno(respiter.filelike):
             return False
 
         try:
diff --git a/gunicorn/util.py b/gunicorn/util.py
index a8875d90e5..896a22141a 100644
--- a/gunicorn/util.py
+++ b/gunicorn/util.py
@@ -510,7 +510,7 @@ def to_bytestring(value, encoding="utf8"):
 
     return value.encode(encoding)
 
-def is_fileobject(obj):
+def has_fileno(obj):
     if not hasattr(obj, "fileno"):
         return False