diff --git a/networking/telnet.c b/networking/telnet.c
index 93eda56e1..bbf0d1997 100644
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -511,7 +511,7 @@ static inline void to_ttype(void)
 #endif
 
 #ifdef CONFIG_FEATURE_AUTOWIDTH
-static inline void to_naws()
+static inline void to_naws(void)
 { 
 	/* Tell server we will do NAWS */
 	putiac2(WILL, TELOPT_NAWS);