diff --git a/lib/ace/layer/cursor.js b/lib/ace/layer/cursor.js
index ccc6d3f7c94..5de2bed3cb8 100644
--- a/lib/ace/layer/cursor.js
+++ b/lib/ace/layer/cursor.js
@@ -62,12 +62,16 @@ var Cursor = function(parentEl) {
         for (var i = cursors.length; i--; )
             cursors[i].style.animationDuration = this.blinkInterval + "ms";
 
+        this.$isAnimating = true;
         setTimeout(function() {
-            dom.addCssClass(this.element, "ace_animate-blinking");
+            if (this.$isAnimating) {
+                dom.addCssClass(this.element, "ace_animate-blinking");
+            }
         }.bind(this));
     };
     
     this.$stopCssAnimation = function() {
+        this.$isAnimating = false;
         dom.removeCssClass(this.element, "ace_animate-blinking");
     };
 
@@ -138,6 +142,7 @@ var Cursor = function(parentEl) {
         this.$stopCssAnimation();
 
         if (this.smoothBlinking) {
+            this.$isSmoothBlinking = false;
             dom.removeCssClass(this.element, "ace_smooth-blinking");
         }
         
@@ -149,8 +154,11 @@ var Cursor = function(parentEl) {
         }
 
         if (this.smoothBlinking) {
-            setTimeout(function(){
-                dom.addCssClass(this.element, "ace_smooth-blinking");
+            this.$isSmoothBlinking = true;
+            setTimeout(function() {
+                if (this.$isSmoothBlinking) {
+                    dom.addCssClass(this.element, "ace_smooth-blinking");
+                }
             }.bind(this));
         }