diff --git a/lib/ot/server.js b/lib/ot/server.js
index fec3b6f..b655929 100644
--- a/lib/ot/server.js
+++ b/lib/ot/server.js
@@ -32,7 +32,8 @@ ot.Server = (function (global) {
     // ... and apply that on the document.
     var newDocument = operation.apply(this.document);
     // ignore if exceed the max length of document
-    if(newDocument.length > config.documentmaxlength) return;
+    if(newDocument.length > config.documentmaxlength && newDocument.length > this.document.length)
+        return;
     this.document = newDocument;
     // Store operation in history.
     this.operations.push(operation);