diff --git a/opentracker.c b/opentracker.c
index b20a4dc..5bd27b0 100644
--- a/opentracker.c
+++ b/opentracker.c
@@ -10,6 +10,7 @@
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <arpa/inet.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <errno.h>