1 files changed, 1 insertions, 0 deletions
diff --git a/demo/refFun.ur b/demo/refFun.ur
index c6a4ea5f..114d4ef0 100644
--- a/demo/refFun.ur
+++ b/demo/refFun.ur
@@ -7,6 +7,7 @@ functor Make(M : sig
 
     sequence s
     table t : { Id : int, Data : M.data }
+      PRIMARY KEY Id
 
     fun new d =
         id <- nextval s;