diff --git a/src/pg.ml b/src/pg.ml
index a8f28e73..dbdfdbd6 100644
--- a/src/pg.ml
+++ b/src/pg.ml
@@ -64,8 +64,7 @@ let preflight =
         "SET search_path TO exchange;";
       ]
   in
-  fun (module Conn : Caqti_miou.CONNECTION) ->
-    Syntax.list_iter (fun p -> Conn.exec p ()) l
+  fun (module Conn : CONN) -> Syntax.list_iter (fun p -> Conn.exec p ()) l
 
 let lookup_signing_key =
   let lookup_signing_key =