diff --git a/lib/ice-coder.js b/lib/ice-coder.js
index 6e3fe1a..5725cf1 100644
--- a/lib/ice-coder.js
+++ b/lib/ice-coder.js
@@ -1487,7 +1487,7 @@ var ICEcoder = {
 		cM = ICEcoder.getcMInstance('new');
 		ICEcoder.switchTab(ICEcoder.openFiles.length);
 
-		cM.removeLineClass(ICEcoder['cMActiveLine'+ICEcoder.selectedTab], "background", null);
+		cM.removeLineClass(ICEcoder['cMActiveLine'+ICEcoder.selectedTab], "background");
 		ICEcoder['cMActiveLine'+ICEcoder.selectedTab] = cM.addLineClass(0, "background", "cm-s-activeLine");
 		ICEcoder.nextcMInstance++;
 	},