diff --git a/runtime/JavaScript/src/antlr4/Lexer.js b/runtime/JavaScript/src/antlr4/Lexer.js
index 3e1edb6ea6..5cb8441e6a 100644
--- a/runtime/JavaScript/src/antlr4/Lexer.js
+++ b/runtime/JavaScript/src/antlr4/Lexer.js
@@ -174,7 +174,7 @@ export default class Lexer extends Recognizer {
      */
 	mode(m) {
 		console.warn("Calling deprecated method in Lexer class: mode(...)");
-		setMode(m);
+		this.setMode(m);
 	}
 
 	setMode(m) {