diff --git a/src/Handler/Utils/LMS.hs b/src/Handler/Utils/LMS.hs
index 3521d431a..0bf580288 100644
--- a/src/Handler/Utils/LMS.hs
+++ b/src/Handler/Utils/LMS.hs
@@ -127,7 +127,7 @@ maxLmsUserIdentRetries = 27
 randomText :: MonadIO m => String -> Int -> m Text
 randomText extra n = fmap pack . evalRandTIO . replicateM n $ uniform range
   where
-    num_letters = ['2'..'9'] ++ ['a'..'z'] \\ ['l']
+    num_letters = ['2'..'9'] ++ ['a'..'k'] ++ ['m'..'z'] -- users have trouble distinguishing 1/l and 0/O so we eliminate these
     range       = extra ++ num_letters
 
 --TODO: consider using package elocrypt for user-friendly passwords here, licence requires mentioning of author, etc. though