diff --git a/scrollfix.js b/scrollfix.js
index c74eb9c..19e6d0f 100644
--- a/scrollfix.js
+++ b/scrollfix.js
@@ -9,7 +9,7 @@
 
 var ScrollFix = function(elem) {
 	// Variables to track inputs
-	var startY = startTopScroll = deltaY = undefined,
+	var startY, startTopScroll;
 	
 	elem = elem || document.querySelector(elem);