diff --git a/serializer.js b/serializer.js
index dac92b7..6aad771 100644
--- a/serializer.js
+++ b/serializer.js
@@ -37,11 +37,10 @@ class SerializerField {
 		} else if(this.type == "checkbox") {
 			let checked = this.field.checked;
 			if(this.field.hasAttribute("string")){
-				if(checked) {
-					return this.field.value
-				} else {
+				if(!checked) {
 					return null;
 				}
+				return this.field.value
 			}
 			return checked;
 		} else {