diff --git a/libs/cloud/picloudtcp.cpp b/libs/cloud/picloudtcp.cpp
index def39395..3a55860b 100644
--- a/libs/cloud/picloudtcp.cpp
+++ b/libs/cloud/picloudtcp.cpp
@@ -62,7 +62,9 @@ void PICloud::TCP::sendStart() {
 	PIByteArray ba;
 	ba << header;
 	ba.append(suuid);
+	mutex_send.lock();
 	streampacker->send(ba);
+	mutex_send.unlock();
 }
 
 
@@ -70,7 +72,9 @@ void PICloud::TCP::sendConnected(uint client_id) {
 	header.type = PICloud::TCP::Connect;
 	PIByteArray ba;
 	ba << header << client_id;
+	mutex_send.lock();
 	streampacker->send(ba);
+	mutex_send.unlock();
 }
 
 
@@ -78,7 +82,9 @@ void PICloud::TCP::sendDisconnected(uint client_id) {
 	header.type = PICloud::TCP::Disconnect;
 	PIByteArray ba;
 	ba << header << client_id;
+	mutex_send.lock();
 	streampacker->send(ba);
+	mutex_send.unlock();
 }
 
 
@@ -88,7 +94,9 @@ int PICloud::TCP::sendData(const PIByteArray & data) {
 	ba << header;
 	ba.append(data);
 //	piCout << "[PICloud::TCP] sendData" << ba.toHex();
+	mutex_send.lock();
 	streampacker->send(ba);
+	mutex_send.unlock();
 	return data.size_s();
 }
 
@@ -98,7 +106,9 @@ int PICloud::TCP::sendData(const PIByteArray & data, uint client_id) {
 	PIByteArray ba;
 	ba << header << client_id;
 	ba.append(data);
+	mutex_send.lock();
 	streampacker->send(ba);
+	mutex_send.unlock();
 	return data.size_s();
 }
 
@@ -108,7 +118,9 @@ void PICloud::TCP::sendPing() {
 	PIByteArray ba;
 	ba << header;
 	ba.append(suuid);
+	mutex_send.lock();
 	streampacker->send(ba);
+	mutex_send.unlock();
 }
 
 
diff --git a/libs/main/cloud/picloudtcp.h b/libs/main/cloud/picloudtcp.h
index c941b51c..aada123f 100644
--- a/libs/main/cloud/picloudtcp.h
+++ b/libs/main/cloud/picloudtcp.h
@@ -25,6 +25,7 @@
 
 #include "pip_cloud_export.h"
 #include "pistring.h"
+#include "pimutex.h"
 
 
 class PIEthernet;
@@ -86,6 +87,8 @@ private:
 	PIByteArray suuid;
 	PIString server_name;
 	PIStreamPacker * streampacker;
+	PIMutex mutex_send;
+
 };
 
 }