diff --git a/core/vm/opcodes.go b/core/vm/opcodes.go
index 3f68b7f9a6..bb42aaf0f3 100644
--- a/core/vm/opcodes.go
+++ b/core/vm/opcodes.go
@@ -109,8 +109,8 @@ const (
 	MLOAD
 	MSTORE
 	MSTORE8
-	SLOAD
 	SLOADEXT
+	SLOAD
 	SSTORE
 	JUMP
 	JUMPI