diff --git a/Lib/opcode.py b/Lib/opcode.py
index e8cccc3..9833b6c 100644
--- a/Lib/opcode.py
+++ b/Lib/opcode.py
@@ -48,7 +48,7 @@
 def_op('ROT_TWO', 2)
 def_op('ROT_THREE', 3)
 def_op('DUP_TOP', 4)
-def_op('ROT_FOUR', 5)
+def_op('DUP_TOP_TWO', 5)
 
 def_op('NOP', 9)
 def_op('UNARY_POSITIVE', 10)
@@ -116,7 +116,6 @@
 name_op('DELETE_ATTR', 96)      # ""
 name_op('STORE_GLOBAL', 97)     # ""
 name_op('DELETE_GLOBAL', 98)    # ""
-def_op('DUP_TOPX', 99)          # number of items to duplicate
 def_op('LOAD_CONST', 100)       # Index in const list
 hasconst.append(100)
 name_op('LOAD_NAME', 101)       # Index in name list