diff --git a/ecal/core/src/io/udp/ecal_udp_sample_sender.cpp b/ecal/core/src/io/udp/ecal_udp_sample_sender.cpp
index 70c16a5399..6a353572f2 100644
--- a/ecal/core/src/io/udp/ecal_udp_sample_sender.cpp
+++ b/ecal/core/src/io/udp/ecal_udp_sample_sender.cpp
@@ -47,6 +47,7 @@ namespace eCAL
     {
       if (!m_udp_sender) return(0);
 
+      std::lock_guard<std::mutex> const send_lock(m_payload_mutex);
       // return value
       size_t sent_sum(0);
 
diff --git a/ecal/core/src/io/udp/ecal_udp_sample_sender.h b/ecal/core/src/io/udp/ecal_udp_sample_sender.h
index afb4dc5411..5a90d2e68f 100644
--- a/ecal/core/src/io/udp/ecal_udp_sample_sender.h
+++ b/ecal/core/src/io/udp/ecal_udp_sample_sender.h
@@ -35,6 +35,7 @@
 #endif
 
 #include <memory>
+#include <mutex>
 #include <vector>
 
 namespace eCAL
@@ -51,6 +52,7 @@ namespace eCAL
       IO::UDP::SSenderAttr                 m_attr;
       std::shared_ptr<IO::UDP::CUDPSender> m_udp_sender;
 
+      std::mutex                           m_payload_mutex;
       std::vector<char>                    m_payload;
     };
   }