diff --git a/owlps-positioner/src/outputtcpsocketevaal.cc b/owlps-positioner/src/outputtcpsocketevaal.cc
index 0f5d35c..956ecaa 100644
--- a/owlps-positioner/src/outputtcpsocketevaal.cc
+++ b/owlps-positioner/src/outputtcpsocketevaal.cc
@@ -94,8 +94,12 @@ void OutputTCPSocketEvAAL::write(const Result &result)
       << "OwlPS "
       << position.get_x() << ' '
       << position.get_y() << ' '
-      << static_cast<uint64_t>(request_time) << ' '
-      << area_of_interest << '\n' ;
+      << static_cast<uint64_t>(request_time) << ' ' ;
+
+  if (area_of_interest > 0)
+    str << area_of_interest ;
+
+  str << '\n' ;
 
   if (send_data(str.str()))
     acknowledge() ;