diff --git a/lib/ace/scrollbar.js b/lib/ace/scrollbar.js
index b667881c..36619bd5 100644
--- a/lib/ace/scrollbar.js
+++ b/lib/ace/scrollbar.js
@@ -85,7 +85,11 @@ var ScrollBar = function(parent) {
      *
      **/
     this.onScroll = function() {
-        this._emit("scroll", {data: this.element.scrollTop});
+        if (!this.skipEvent) {
+            this.scrollTop = this.element.scrollTop;
+            this._emit("scroll", {data: this.scrollTop});
+        }
+        this.skipEvent = false;
     };
 
     /**
@@ -120,7 +124,7 @@ var ScrollBar = function(parent) {
     };
 
 
-    // TODO: on chrome 17+ for small zoom levels after calling this function
+    // on chrome 17+ for small zoom levels after calling this function
     // this.element.scrollTop != scrollTop which makes page to scroll up.
     /**
      * Sets the scroll top of the scroll bar.
@@ -130,7 +134,10 @@ var ScrollBar = function(parent) {
      *
      **/
     this.setScrollTop = function(scrollTop) {
-        this.element.scrollTop = scrollTop;
+        if (this.scrollTop != scrollTop) {
+            this.skipEvent = true;
+            this.scrollTop = this.element.scrollTop = scrollTop;
+        }
     };
 
 }).call(ScrollBar.prototype);