diff --git a/lib/evmone/instructions_opcodes.hpp b/lib/evmone/instructions_opcodes.hpp
index a08f5db2e7..9d1efbb66c 100644
--- a/lib/evmone/instructions_opcodes.hpp
+++ b/lib/evmone/instructions_opcodes.hpp
@@ -164,9 +164,9 @@ enum Opcode : uint8_t
     OP_SWAPN = 0xb6,
 
     OP_DATALOAD = 0xb7,
-    OP_DATASIZE = 0xb8,
-    OP_DATACOPY = 0xb9,
-    OP_DATALOADN = 0xba,
+    OP_DATALOADN = 0xb8,
+    OP_DATASIZE = 0xb9,
+    OP_DATACOPY = 0xba,
 
     OP_CREATE = 0xf0,
     OP_CALL = 0xf1,