diff --git a/lib/Associations/One.js b/lib/Associations/One.js
index aa6ce1cf..6d34d91c 100644
--- a/lib/Associations/One.js
+++ b/lib/Associations/One.js
@@ -130,7 +130,7 @@ function extendInstance(Model, Instance, Driver, association, opts, cb) {
 		},
 		enumerable: false
 	});
-	if (association.reversed) {
+	if (!association.reversed) {
 		Object.defineProperty(Instance, association.delAccessor, {
 			value: function (cb) {
 				Instance[association.field] = 0;