diff --git a/test/functional/test_framework/script.py b/test/functional/test_framework/script.py
--- a/test/functional/test_framework/script.py
+++ b/test/functional/test_framework/script.py
@@ -243,7 +243,7 @@
 OP_CHECKDATASIGVERIFY = CScriptOp(0xbb)
 
 # additional byte string operations
-OP_BSWAP = CScriptOp(0xc0)
+OP_BSWAP = CScriptOp(0xbc)
 
 # multi-byte opcodes
 OP_PREFIX_BEGIN = CScriptOp(0xf0)