diff --git a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/preferences/AccountPreferenceFragment.kt b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/preferences/AccountPreferenceFragment.kt
index 67ce046248..359bb4b9a2 100644
--- a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/preferences/AccountPreferenceFragment.kt
+++ b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/preferences/AccountPreferenceFragment.kt
@@ -419,7 +419,7 @@ class AccountPreferenceFragment :
         }
     }
 
-    private val regex = "[^a-z0-9_-]".toRegex()
+    private val regex = "[^a-zA-Z0-9_-]".toRegex()
 
     private fun showLoginNameDialog() {
         showSingleEntryDialog(user?.username, getString(R.string.username), {