diff --git a/Lib/pickletools.py b/Lib/pickletools.py
index 7121c2a..065498c 100644
--- a/Lib/pickletools.py
+++ b/Lib/pickletools.py
@@ -1348,7 +1348,7 @@
       arg=None,
       stack_before=[markobject, stackslice],
       stack_after=[],
-      proto=0,
+      proto=1,
       doc="""Pop all the stack objects at and above the topmost markobject.
 
       When an opcode using a variable number of stack objects is done,