diff --git a/srcpkgs/swi-prolog/update b/srcpkgs/swi-prolog/update
index bef88c753fa..38b15c928d1 100644
--- a/srcpkgs/swi-prolog/update
+++ b/srcpkgs/swi-prolog/update
@@ -1,2 +1,2 @@
-site="http://www.swi-prolog.org/download/stable"
-pattern='pl-\K[\d.]+\d'
+site='http://www.swi-prolog.org/download/stable/src/'
+pattern='pl-\K[\d.]+\d(?=\.tar)'