diff --git a/lib/validator.js b/lib/validator.js
index 261afa9..30d692a 100644
--- a/lib/validator.js
+++ b/lib/validator.js
@@ -40,7 +40,8 @@ function passwordsMatch(password1, password2) {
  * @return {Object} results
  * @return {Map<string, string>} results.fields - Sanitised and validated fields
  */
-function validate(body, fields, validation = {}) {
+function validate(originalBody, fields, validation = {}) {
+	const body = { ...originalBody };
 	const fieldsMap = new Map();
 
 	// Check all required fields are not empty, and sanitise them
@@ -51,8 +52,13 @@ function validate(body, fields, validation = {}) {
 			throw new Error(`${field} is missing`);
 
 		fieldsMap.set(field, cleanField);
+
+		delete body[field];
 	}
 
+	for (const [ field, content ] of Object.entries(body))
+		fieldsMap.set(field, content);
+
 	// Handle validation as required in options
 	for (const [ check, checkOpts ] of Object.entries(validation)) {
 		let valid;