diff --git a/conn.go b/conn.go
index cb9ba72..f681b05 100644
--- a/conn.go
+++ b/conn.go
@@ -76,18 +76,8 @@ func (wic *websocketIRCConn) WriteMessage(msg *irc.Message) error {
 	return wic.conn.Write(ctx, websocket.MessageText, b)
 }
 
-func isErrWebSocketClosed(err error) bool {
-	return err != nil && strings.HasSuffix(err.Error(), "failed to close WebSocket: already wrote close")
-}
-
 func (wic *websocketIRCConn) Close() error {
-	err := wic.conn.Close(websocket.StatusNormalClosure, "")
-	// TODO: remove once this PR is merged:
-	// https://github.com/nhooyr/websocket/pull/303
-	if isErrWebSocketClosed(err) {
-		return nil
-	}
-	return err
+	return wic.conn.Close(websocket.StatusNormalClosure, "")
 }
 
 func (wic *websocketIRCConn) SetReadDeadline(t time.Time) error {