diff --git a/owlps-positioning/src/outputnetworksocket.hh b/owlps-positioning/src/outputnetworksocket.hh
index 8c363dc..a6b41f7 100644
--- a/owlps-positioning/src/outputnetworksocket.hh
+++ b/owlps-positioning/src/outputnetworksocket.hh
@@ -6,6 +6,7 @@
 #include <string>
 #include <stdint.h> // <cstdint> is not C++ 98 compliant
 #include <arpa/inet.h>
+#include <netinet/in.h>
 
 /// Parent class for all output media that use network sockets
 class OutputNetworkSocket: public OutputMedium