diff --git a/src/protocols/secure_channel/Constants.h b/src/protocols/secure_channel/Constants.h
index 57465a4e3414a6..f624ee63612af4 100644
--- a/src/protocols/secure_channel/Constants.h
+++ b/src/protocols/secure_channel/Constants.h
@@ -71,6 +71,8 @@ enum class MsgType : uint8_t
     CASE_Sigma2Resume = 0x33,
 
     StatusReport = 0x40,
+
+    ICD_CheckIn = 0x50,
 };
 
 // Placeholder value for the ProtocolCode field when the GeneralCode is Success or Continue.