diff --git a/websocket/_app.py b/websocket/_app.py
index dfa5237..f258b65 100644
--- a/websocket/_app.py
+++ b/websocket/_app.py
@@ -227,8 +227,12 @@ class WebSocketApp(object):
         if they exists, and if the self.on_close except three arguments """
         import inspect
         # if the on_close callback is "old", just return empty list
-        if not self.on_close or len(inspect.getargspec(self.on_close).args) != 3:
-            return []
+        if sys.version_info < (3, 0):
+            if not self.on_close or len(inspect.getargspec(self.on_close).args) != 3:
+                return []
+        else:
+            if not self.on_close or len(inspect.getfullargspec(self.on_close).args) != 3:
+                return []
 
         if data and len(data) >= 2:
             code = 256*six.byte2int(data[0:1]) + six.byte2int(data[1:2])