diff --git a/src/all/allpref.xfst b/src/all/allpref.xfst
index 6d8f3bb..5c2e3c2 100644
--- a/src/all/allpref.xfst
+++ b/src/all/allpref.xfst
@@ -13,6 +13,7 @@
 
 define Digit [%0|1|2|3|4|5|6|7|8|9];
 define AsciiLetter [a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t|u|v|w|x|y|z];
+define AsciiLetterCap [A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z];
 define HexLetter [Digit|a|A|b|B|c|C|d|D|e|E|f|F];
 define EOT "\u0004";