diff --git a/src/editor.js b/src/editor.js
index 5a8d0728..c155ab68 100644
--- a/src/editor.js
+++ b/src/editor.js
@@ -133,6 +133,7 @@
      * Deactivate editor (make it readonly)
      */
     disable: function() {
+      this.synchronizer.disable();
       this.currentView.disable();
       return this;
     },
diff --git a/src/views/synchronizer.js b/src/views/synchronizer.js
index b28855fa..a572fe9b 100644
--- a/src/views/synchronizer.js
+++ b/src/views/synchronizer.js
@@ -51,6 +51,14 @@
       }
     },
 
+    /**
+     * Deactivate editor (make it readonly)
+     */
+    disable: function() {
+      this._domObserveSubmit.stop();
+      this._domObserveReset.stop();
+    },
+
     /**
      * Initializes interval-based syncing
      * also makes sure that on-submit the composer's content is synced with the textarea
@@ -73,10 +81,10 @@
       if (form) {
         // If the textarea is in a form make sure that after onreset and onsubmit the composer
         // has the correct state
-        wysihtml5.dom.observe(form, "submit", function() {
+        this._domObserveSubmit = wysihtml5.dom.observe(form, "submit", function() {
           that.sync(true);
         });
-        wysihtml5.dom.observe(form, "reset", function() {
+        this._domObserveReset = wysihtml5.dom.observe(form, "reset", function() {
           setTimeout(function() { that.fromTextareaToComposer(); }, 0);
         });
       }