diff --git a/lib/compiler/js.js b/lib/compiler/js.js
index 9d1fb71..d0abe0a 100644
--- a/lib/compiler/js.js
+++ b/lib/compiler/js.js
@@ -34,7 +34,7 @@ const js = {
 
     },
 
-    regexpClassEscape( s ) {
+    regexpEscape( s ) {
 
         // Based on ECMA-262, 5th ed., 7.8.5 & 15.10.1.
         //
diff --git a/lib/compiler/passes/generate-js.js b/lib/compiler/passes/generate-js.js
index 1a4a278..b82742b 100644
--- a/lib/compiler/passes/generate-js.js
+++ b/lib/compiler/passes/generate-js.js
@@ -52,13 +52,15 @@ function generateJS( ast, session, options ) {
             return "/^["
                 + ( cls.inverted ? "^" : "" )
                 + cls.value
-                    .map( part =>
-                        ( Array.isArray( part )
-                        ? js.regexpClassEscape( part[ 0 ] )
-                            + "-"
-                            + js.regexpClassEscape( part[ 1 ] )
-                        : js.regexpClassEscape( part ) )
-                    )
+                    .map( part => (
+
+                        Array.isArray( part )
+                            ? js.regexpEscape( part[ 0 ] )
+                                + "-"
+                                + js.regexpEscape( part[ 1 ] )
+                            : js.regexpEscape( part )
+
+                    ) )
                     .join( "" )
                 + "]/"
                 + ( cls.ignoreCase ? "i" : "" );
diff --git a/lib/typings/modules.d.ts b/lib/typings/modules.d.ts
index ebd6969..4b1a94b 100644
--- a/lib/typings/modules.d.ts
+++ b/lib/typings/modules.d.ts
@@ -65,7 +65,8 @@ declare module "pegjs/lib/compiler/js" {
     namespace js {
 
         function stringEscape( s: string ): string;
-        function regexpClassEscape( s: string ): string;
+        function regexpEscape( s: string ): string;
+        const reservedWords: string[];
 
     }
     export default js;