diff --git a/lib/irc.js b/lib/irc.js
index 7c730db..16fbee6 100644
--- a/lib/irc.js
+++ b/lib/irc.js
@@ -43,11 +43,11 @@ const tagEscapeMap = {
 const tagUnescapeMap = Object.fromEntries(Object.entries(tagEscapeMap).map(([from, to]) => [to, from]));
 
 function escapeTag(s) {
-	return s.replace(/[; \\\r\n]/, (ch) => tagEscapeMap[ch]);
+	return String(s).replace(/[; \\\r\n]/g, (ch) => tagEscapeMap[ch]);
 }
 
 function unescapeTag(s) {
-	return s.replace(/\\[:s\\rn]/, (seq) => tagUnescapeMap[seq]);
+	return s.replace(/\\[:s\\rn]/g, (seq) => tagUnescapeMap[seq]);
 }
 
 export function parseTags(s) {