diff --git a/protocol/src/main/protos/core/Tron.proto b/protocol/src/main/protos/core/Tron.proto
index 2ffefbf9f3e..f75faeeac33 100644
--- a/protocol/src/main/protos/core/Tron.proto
+++ b/protocol/src/main/protos/core/Tron.proto
@@ -601,7 +601,7 @@ enum ReasonCode {
   CONNECT_FAIL = 0x21;
   TOO_MANY_PEERS_WITH_SAME_IP = 0x22;
   LIGHT_NODE_SYNC_FAIL = 0x23;
-  BELOW_THAN_ME = 0X24;
+  BELOW_THAN_ME = 0x24;
   NOT_WITNESS = 0x25;
   NO_SUCH_MESSAGE = 0x26;
   UNKNOWN = 0xFF;