diff --git a/lib/src/main/java/com/auth0/android/lock/views/ValidatedInputView.java b/lib/src/main/java/com/auth0/android/lock/views/ValidatedInputView.java
index 77f81dfad..c1bf79db7 100644
--- a/lib/src/main/java/com/auth0/android/lock/views/ValidatedInputView.java
+++ b/lib/src/main/java/com/auth0/android/lock/views/ValidatedInputView.java
@@ -71,7 +71,7 @@
 
 public class ValidatedInputView extends LinearLayout {
 
-    public static final String USERNAME_REGEX = "^[a-zA-Z0-9_]+$";
+    public static final String USERNAME_REGEX = "^[a-zA-Z0-9_@^$.#!`+\\-'~]+$";
     public static final String PHONE_NUMBER_REGEX = "^[0-9]{6,14}$";
     public static final String CODE_REGEX = "^[0-9]{4,12}$";
     public static final String EMAIL_REGEX = "[a-zA-Z0-9-.!#$%&'*+–/=?^_`{|}~]{1,64}@[a-z0-9-.]{1,255}";