diff --git a/src/Handler/Utils/Profile.hs b/src/Handler/Utils/Profile.hs
index d473bd54d..4f8e87546 100644
--- a/src/Handler/Utils/Profile.hs
+++ b/src/Handler/Utils/Profile.hs
@@ -83,7 +83,7 @@ validEmail :: Email -> Bool      -- Email = Text
 validEmail email = validRFC5322 && not invalidFraport
   where 
     validRFC5322 = Email.isValid $ encodeUtf8 email
-    invalidFraport = case Text.stripSuffix "@fraport.de" email of  
+    invalidFraport = case Text.stripSuffix "@fraport.de" (foldCase email) of  
       Just fralogin -> all isDigit $ drop 1 fralogin
       Nothing       -> False