diff --git a/src/bulgarian/ResBul.gf b/src/bulgarian/ResBul.gf
index 580f2be91..9b2e10db4 100644
--- a/src/bulgarian/ResBul.gf
+++ b/src/bulgarian/ResBul.gf
@@ -467,7 +467,7 @@ resource ResBul = ParamX ** open Prelude, Predef in {
 
     ia2e : Str -> Str =           -- to be used when the next syllable has vowel different from "à","ú","î" or "ó"
       \s -> case s of {
-              x@(_*+_) + "ÿ" + y@(("á"|"â"|"ã"|"ä"|"æ"|"ç"|"ê"|"ë"|"ì"|"í"|"ï"|"ð"|"ñ"|"ò"|"ô"|"õ"|"ö"|"÷"|"ø"|"ù")*)
+              x@(_*+_) + "ÿ" + y@(("á"|"â"|"ã"|"ä"|"æ"|"ç"|"ê"|"ë"|"ì"|"í"|"ï"|"ð"|"ñ"|"ò"|"ô"|"õ"|"ö"|"÷"|"ø")*)
                 => x+"å"+y;
               _ => s
             };