diff --git a/libraries/MySensors/core/MyTransport.cpp b/libraries/MySensors/core/MyTransport.cpp
index fe6c948..2fadefb 100644
--- a/libraries/MySensors/core/MyTransport.cpp
+++ b/libraries/MySensors/core/MyTransport.cpp
@@ -96,7 +96,7 @@ inline void transportProcess() {
 				 (type != I_GET_NONCE_RESPONSE && type != I_GET_NONCE && type != I_REQUEST_SIGNING &&
 				  type != I_ID_REQUEST && type != I_ID_RESPONSE && 
 				  type != I_FIND_PARENT && type != I_FIND_PARENT_RESPONSE &&
-				  type != I_HEARTBEAT))) {
+				  type != I_HEARTBEAT && type != I_HEARTBEAT_RESPONSE))) {
 				if (!mGetSigned(_msg)) {
 					// Got unsigned message that should have been signed
 					debug(PSTR("no sign\n"));
@@ -415,7 +415,8 @@ boolean transportSendRoute(MyMessage &message) {
 			(mGetCommand(message) != C_INTERNAL ||
 			 (type != I_GET_NONCE && type != I_GET_NONCE_RESPONSE && type != I_REQUEST_SIGNING &&
 			  type != I_ID_REQUEST && type != I_ID_RESPONSE &&
-			  type != I_FIND_PARENT && type != I_FIND_PARENT_RESPONSE))) {
+			  type != I_FIND_PARENT && type != I_FIND_PARENT_RESPONSE &&
+			  type != I_HEARTBEAT && type != I_HEARTBEAT_RESPONSE))) {
 			// Send nonce-request
 			_signingNonceStatus=SIGN_WAITING_FOR_NONCE;
 			if (!_sendRoute(build(_msgTmp, _nc.nodeId, message.destination, message.sensor, C_INTERNAL, I_GET_NONCE, false).set(""))) {