diff --git a/plugins/chargen.c b/plugins/chargen.c
index b3e1febc..97e463da 100644
--- a/plugins/chargen.c
+++ b/plugins/chargen.c
@@ -75,10 +75,9 @@ static int send_peer(int sd, char *buf, ssize_t len, struct sockaddr *sa, sockle
 	return sendto(sd, pattern, strlen(pattern), MSG_DONTWAIT, sa, sa_len);
 }
 
-static int cb(int type)
+static int cb(int UNUSED(type))
 {
 	int sd = STDIN_FILENO;
-	ssize_t len;
 	char buf[BUFSIZ];
 	struct sockaddr_storage sa;
 	socklen_t sa_len = sizeof(sa);
diff --git a/plugins/daytime.c b/plugins/daytime.c
index 4ea9ce11..929c9c1f 100644
--- a/plugins/daytime.c
+++ b/plugins/daytime.c
@@ -64,7 +64,7 @@ static int send_peer(int sd, char *buf, ssize_t len, struct sockaddr *sa, sockle
 	return sendto(sd, now, strlen(now), MSG_DONTWAIT, sa, sa_len);
 }
 
-static int cb(int type)
+static int cb(int UNUSED(type))
 {
 	int sd = STDIN_FILENO;
 	char buf[BUFSIZ];
diff --git a/plugins/discard.c b/plugins/discard.c
index 94bc56c7..beb386ad 100644
--- a/plugins/discard.c
+++ b/plugins/discard.c
@@ -27,7 +27,7 @@
 
 #include "../plugin.h"
 
-static int cb(int type)
+static int cb(int UNUSED(type))
 {
 	int sd = STDIN_FILENO;
 	char buf[BUFSIZ];