diff --git a/pyext.py b/pyext.py
index 2f4645a..dee1e1c 100644
--- a/pyext.py
+++ b/pyext.py
@@ -31,6 +31,9 @@
 
 import sys, inspect, types, functools
 
+if not hasattr(inspect, 'getargspec'):
+    inspect.getargspec = inspect.getfullargspec
+           
 def _targspec(func, specs, attr='__orig_arg__'):
     if hasattr(func, '__is_overload__') and func.__is_overload__:
         return getattr(func, attr)