diff --git a/lib/ace/mode/r.js b/lib/ace/mode/r.js
index 0c60c120..a5421a81 100644
--- a/lib/ace/mode/r.js
+++ b/lib/ace/mode/r.js
@@ -36,7 +36,9 @@ define(function(require, exports, module) {
 
    (function()
    {
-      this.tokenRe = new RegExp("^["
+      this.lineCommentStart = "#";
+      // todo import codeModel from RStudio
+      /*this.tokenRe = new RegExp("^["
           + unicode.packages.L
           + unicode.packages.Mn + unicode.packages.Mc
           + unicode.packages.Nd
@@ -126,7 +128,7 @@ define(function(require, exports, module) {
             }
          }
          return false;
-      };
+      };*/
    }).call(Mode.prototype);
    exports.Mode = Mode;
 });
diff --git a/lib/ace/mode/rhtml.js b/lib/ace/mode/rhtml.js
index c45f85ac..99885dbf 100644
--- a/lib/ace/mode/rhtml.js
+++ b/lib/ace/mode/rhtml.js
@@ -56,10 +56,10 @@ oop.inherits(Mode, HtmlMode);
       return this.$session.getState(position.row).match(/^r-/) ? 'R' : 'HTML';
    };
 
-   this.getNextLineIndent = function(state, line, tab, tabSize, row)
+   /* this.getNextLineIndent = function(state, line, tab, tabSize, row)
    {
       return this.codeModel.getNextLineIndent(row, line, state, tab, tabSize);
-   };
+   }; */
 
 }).call(Mode.prototype);