diff --git a/util-linux/rdate.c b/util-linux/rdate.c
index e589077a6..70dcb24e9 100644
--- a/util-linux/rdate.c
+++ b/util-linux/rdate.c
@@ -38,7 +38,7 @@
 
 static const int RFC_868_BIAS = 2208988800UL;
 
-static void socket_timeout()
+static void socket_timeout(void)
 {
 	bb_error_msg_and_die("timeout connecting to time server");
 }