diff --git a/websocket/_http.py b/websocket/_http.py
index 989c8bc..256ed29 100644
--- a/websocket/_http.py
+++ b/websocket/_http.py
@@ -119,7 +119,7 @@ def _open_socket(addrinfo_list, sockopt, timeout):
 
 
 def _can_use_sni():
-    return (six.Py2 and sys.version_info[1] >= 7 and sys.version_info[2] >= 9) or (six.PY3 and sys.version_info[2] >= 2)
+    return (six.PY2 and sys.version_info[1] >= 7 and sys.version_info[2] >= 9) or (six.PY3 and sys.version_info[2] >= 2)
 
 
 def _wrap_sni_socket(sock, sslopt, hostname):
@@ -145,7 +145,7 @@ def _ssl_socket(sock, user_sslopt, hostname):
     sslopt.update(user_sslopt)
     check_hostname = sslopt.pop('check_hostname', True)
 
-    if _can_use_sni:
+    if _can_use_sni():
         sock = _wrap_sni_socket(sock, sslopt, hostname)
     else:
         sock = ssl.wrap_socket(sock, **sslopt)