diff --git a/irc/constants.go b/irc/constants.go
index f68c0c9e..02a78ab2 100644
--- a/irc/constants.go
+++ b/irc/constants.go
@@ -19,7 +19,7 @@ var (
 	// regexps
 	ChannelNameExpr = regexp.MustCompile(`^[&!#+][\pL\pN]{1,63}$`)
 	NicknameExpr    = regexp.MustCompile(
-		"^[\\pL\\[\\]{}^`_][\\pL\\pN\\[\\]{}^`_]{1,31}$")
+		"^[\\pL\\[\\]{}^`_][\\pL\\pN\\[\\]{}^`_|]{1,31}$")
 )
 
 const (