diff --git a/Lib/inspect.py b/Lib/inspect.py
index 2363826..d3d946d 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -819,7 +819,7 @@
     'varargs' and 'varkw' are the names of the * and ** arguments or None.
     'locals' is the locals dictionary of the given frame."""
     args, varargs, varkw = getargs(frame.f_code)
-    return args, varargs, varkw, frame.f_locals
+    return ArgInfo(args, varargs, varkw, frame.f_locals)
 
 def joinseq(seq):
     if len(seq) == 1: