diff --git a/owlps-positioner/src/outputtcpsocketevaal.cc b/owlps-positioner/src/outputtcpsocketevaal.cc
index 956ecaa..8c2c4b1 100644
--- a/owlps-positioner/src/outputtcpsocketevaal.cc
+++ b/owlps-positioner/src/outputtcpsocketevaal.cc
@@ -135,7 +135,9 @@ area_of_interest_number(const Point3D &position) const
  */
 bool OutputTCPSocketEvAAL::send_data(const string &data) const
 {
-  unsigned int data_len = data.size() + 1 ; // +1 for the '\0'
+  // Do *not* add one extra character for the '\0', it must not be sent!
+  unsigned int data_len = data.size() ;
+
   ssize_t nsent = send(sockfd, data.c_str(), data_len, 0) ;
   if (nsent != static_cast<ssize_t>(data_len))
     {