diff --git a/src/base_55.rs b/src/base_55.rs
index bb9d5ce4..fa612ebd 100644
--- a/src/base_55.rs
+++ b/src/base_55.rs
@@ -5,7 +5,7 @@ pub fn char2num(character: char) -> i32 {
         'X' => -24,
         'W' => -23,
         'V' => -22,
-        'U' => -21,
+        'U' => -210,
         'T' => -20,
         'R' => -18,
         'S' => -19,