diff --git a/src/czech/ResCze.gf b/src/czech/ResCze.gf
index df92c24c..5fd89f75 100644
--- a/src/czech/ResCze.gf
+++ b/src/czech/ResCze.gf
@@ -487,7 +487,7 @@ adjFormsAdjective : AdjForms -> Adjective = \afs -> {
         _ + "í"  => jarniAdjForms s ;
         _ + "ův" => otcuvAdjForms s ;
         _ + "in" => matcinAdjForms s ;
-        _ => matcinAdjForms ("??" + s) -- Predef.error ("no mkA for" ++ s)
+        _ => matcinAdjForms ("" + s) -- Predef.error ("no mkA for" ++ s)
         } ;
 
 -- hard declension