diff --git a/appl/telnet/telnetd/defs.h b/appl/telnet/telnetd/defs.h
index 0bfcafaa0..caa77f192 100644
--- a/appl/telnet/telnetd/defs.h
+++ b/appl/telnet/telnetd/defs.h
@@ -72,6 +72,7 @@
 #endif
 
 #include <netinet/in.h>
+#include <arpa/inet.h>
 
 #include <arpa/telnet.h>