diff --git a/src/supported.c b/src/supported.c
index abe1d506..3a4ed074 100644
--- a/src/supported.c
+++ b/src/supported.c
@@ -288,16 +288,22 @@ isupport_extban(const void *ptr)
 	return result;
 }
 
+static const char *
+isupport_nicklen(const void *ptr)
+{
+	static char result[200];
+
+	rb_snprintf(result, sizeof result, "%u", ConfigFileEntry.nicklen - 1);
+	return result;
+}
+
 void
 init_isupport(void)
 {
 	static int maxmodes = MAXMODEPARAMS;
 	static int channellen = LOC_CHANNELLEN;
 	static int topiclen = TOPICLEN;
-	static int nicklen = NICKLEN - 1;
-	static int nicklen_usable;
-
-	nicklen_usable = ConfigFileEntry.nicklen - 1;
+	static int maxnicklen = NICKLEN - 1;
 
 	add_isupport("CHANTYPES", isupport_chantypes, NULL);
 	add_isupport("EXCEPTS", isupport_boolean, &ConfigChannel.use_except);
@@ -313,8 +319,8 @@ init_isupport(void)
 	add_isupport("CALLERID", isupport_string, "g");
 	add_isupport("CASEMAPPING", isupport_string, "rfc1459");
 	add_isupport("CHARSET", isupport_string, "ascii");
-	add_isupport("NICKLEN", isupport_intptr, &nicklen);
-	add_isupport("NICKLEN_USABLE", isupport_intptr, &nicklen_usable);
+	add_isupport("NICKLEN", isupport_nicklen, NULL);
+	add_isupport("MAXNICKLEN", isupport_intptr, &maxnicklen);
 	add_isupport("CHANNELLEN", isupport_intptr, &channellen);
 	add_isupport("TOPICLEN", isupport_intptr, &topiclen);
 	add_isupport("ETRACE", isupport_string, "");