diff --git a/lib/node.js b/lib/node.js
index b409dd3..f11cee6 100644
--- a/lib/node.js
+++ b/lib/node.js
@@ -669,9 +669,9 @@ Node.prototype.setWatches = function()
 
 			if(time < 5)
 			{
-				this._chainDebouncer++;
+				self._chainDebouncer++;
 			} else {
-				this._chainDebouncer = 0;
+				self._chainDebouncer = 0;
 			}
 
 			if(this._chainDebouncer < 20)