diff --git a/lib/client.js b/lib/client.js
index cc6f525..1622479 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -354,13 +354,13 @@ export default class Client extends EventTarget {
 	addAvailableCaps(s) {
 		let l = s.split(" ");
 		l.forEach((s) => {
-			let parts = s.split("=");
-			let k = parts[0].toLowerCase();
-			let v = "";
-			if (parts.length > 1) {
-				v = parts[1];
+			let i = s.indexOf("=");
+			let k = s, v = "";
+			if (i >= 0) {
+				k = s.slice(0, i);
+				v = s.slice(i + 1);
 			}
-			this.availableCaps[k] = v;
+			this.availableCaps[k.toLowerCase()] = v;
 		});
 	}