diff --git a/lib/irc.js b/lib/irc.js
index e70f6cd..2286fcb 100644
--- a/lib/irc.js
+++ b/lib/irc.js
@@ -364,6 +364,13 @@ export function parseCTCP(msg) {
 	return ctcp;
 }
 
+function unescapeISUPPORTValue(s) {
+	return s.replace(/\\x[0-9A-Z]{2}/gi, (esc) => {
+		let hex = esc.slice(2);
+		return String.fromCharCode(parseInt(hex, 16));
+	});
+}
+
 export function parseISUPPORT(tokens, params) {
 	let changed = [];
 	tokens.forEach((tok) => {
@@ -377,7 +384,7 @@ export function parseISUPPORT(tokens, params) {
 		let k = tok, v = "";
 		if (i >= 0) {
 			k = tok.slice(0, i);
-			v = tok.slice(i + 1);
+			v = unescapeISUPPORTValue(tok.slice(i + 1));
 		}
 
 		k = k.toUpperCase();