1 files changed, 2 insertions, 2 deletions
diff --git a/src/interpreter/PeggyParser.js b/src/interpreter/PeggyParser.js
index 632f1b7..5671d91 100644
--- a/src/interpreter/PeggyParser.js
+++ b/src/interpreter/PeggyParser.js
@@ -201,7 +201,7 @@ export default (function () {
     );
   };
 
-  function peg$parse(input, options, allowUnderscores = false) {
+  function peg$parse(input, options) {
     options = options !== undefined ? options : {};
 
     var peg$FAILED = {};
@@ -215,7 +215,7 @@ export default (function () {
     var peg$c2 = ".";
     var peg$c3 = "\r\n";
 
-    var peg$r0 = allowUnderscores ? /^[a-zA-Z0-9]_/ : /^[a-zA-Z0-9]/;
+    var peg$r0 = /^[a-zA-Z0-9]/;
     var peg$r1 = /^[\\\u03BB]/;
     var peg$r2 = /^[\t-\n ]/;