diff --git a/frontend/src/validation-rules.js b/frontend/src/validation-rules.js
index d75ca6dc3..a2976c859 100644
--- a/frontend/src/validation-rules.js
+++ b/frontend/src/validation-rules.js
@@ -165,7 +165,7 @@ export const loadAllRules = (i18nCallback, apollo) => {
 
   extend('validIdentifier', {
     validate(value) {
-      const isEmail = !!emailRegex.test(value)
+      const isEmail = !!EMAIL_REGEX.test(value)
       const isUsername = !!value.match(usernameRegex)
       const isGradidoId = validateUuid(value) && versionUuid(value) === 4
       return isEmail || isUsername || isGradidoId