diff --git a/src/lib/arduino_lorawan_sessionstate.cpp b/src/lib/arduino_lorawan_sessionstate.cpp
index 3b77e65..12103ca 100644
--- a/src/lib/arduino_lorawan_sessionstate.cpp
+++ b/src/lib/arduino_lorawan_sessionstate.cpp
@@ -286,6 +286,9 @@ bool Arduino_LoRaWAN::SessionState::isValid() const
     case Arduino_LoRaWAN::SessionChannelMask_Header::eMaskKind::kUSlike:
         return this->V1.Channels.Header.Size == sizeof(this->V1.Channels.USlike);
 
+    case Arduino_LoRaWAN::SessionChannelMask_Header::eMaskKind::kCNlike:
+        return this->V1.Channels.Header.Size == sizeof(this->V1.Channels.CNlike);
+
     default:
         return false;
         }