diff --git a/lib/Associations/Many.js b/lib/Associations/Many.js
index f19f75ac..1500772d 100644
--- a/lib/Associations/Many.js
+++ b/lib/Associations/Many.js
@@ -135,7 +135,7 @@ function extendInstance(Model, Instance, Driver, association, opts, createInstan
 	function adjustForMapsTo(options) {
 		// Loop through the (cloned) association model id fields ... some of them may've been mapped to different
 		// names in the actual database - if so update to the mapped database column name
-		for(i=0; i<options.__merge.to.field.length; i++) {
+		for(var i=0; i<options.__merge.to.field.length; i++) {
 			var idProp = association.model.properties[options.__merge.to.field[i]];
 			if(idProp && idProp.mapsTo) {
 				options.__merge.to.field[i] = idProp.mapsTo;