diff --git a/lib/src/catalan/NumeralCat.gf b/lib/src/catalan/NumeralCat.gf
index d385127b2..e4037a057 100644
--- a/lib/src/catalan/NumeralCat.gf
+++ b/lib/src/catalan/NumeralCat.gf
@@ -1,4 +1,4 @@
-concrete NumeralCat of Numeral = CatCat ** 
+concrete NumeralCat of Numeral = CatCat [Numeral,Digits] ** 
   open CommonRomance, ResRomance, MorphoCat, Prelude in {
 
 --