diff --git a/lib/src/finnish/ConstructionFin.gf b/lib/src/finnish/ConstructionFin.gf
index a15ab1a0c..7a499ff5d 100644
--- a/lib/src/finnish/ConstructionFin.gf
+++ b/lib/src/finnish/ConstructionFin.gf
@@ -30,7 +30,7 @@ lincat
   Year = NP ;
 lin
   monday_Weekday = mkWeekday "maanantai" ;
-  tuesday_Weekday = mkWeekday "tiistaisi" ;
+  tuesday_Weekday = mkWeekday "tiistai" ;
   wednesday_Weekday = mkWeekday "keskiviikko" ;
   thursday_Weekday = mkWeekday "torstai" ;
   friday_Weekday = mkWeekday "perjantai" ;