diff --git a/lib/ace/edit_session.js b/lib/ace/edit_session.js
index 6afa7107..14d195a8 100644
--- a/lib/ace/edit_session.js
+++ b/lib/ace/edit_session.js
@@ -1088,8 +1088,8 @@ var EditSession = function(text, mode) {
             }
         }
 
-        if (useWrapMode && this.$wrapData.length != this.doc.$lines.length) {
-            console.error("The length of doc.$lines and $wrapData have to be the same!");
+        if (useWrapMode && this.$wrapData.length != this.doc.getLength()) {
+            console.error("doc.getLength() and $wrapData.length have to be the same!");
         }
 
         useWrapMode && this.$updateWrapData(firstRow, lastRow);