diff --git a/src/malay/ResMay.gf b/src/malay/ResMay.gf
index cbc33ef4..6142f10c 100644
--- a/src/malay/ResMay.gf
+++ b/src/malay/ResMay.gf
@@ -237,16 +237,16 @@ oper
 
   mkVerb2 : Verb -> Preposition -> Verb2 = \v,pr -> v ** {
     c2 = pr ;
-    passive = "di" + v.s ! Root
+    passive = "di" ++ v.s ! Root
     } ;
 
   mkVerb3 : Verb -> (p,q : Preposition) -> Verb3 = \v,p,q ->
     mkVerb2 v p ** {c3 = q} ;
 
   mkVerb4 : Verb -> Preposition -> Str -> Verb4 = \v,pr,str -> v ** {
-    s = \\_ => v.s ! Active + str;
+    s = \\_ => v.s ! Active ++ str;
     c2 = pr ;
-    passive = "di" + v.s ! Root + str
+    passive = "di" ++ v.s ! Root + str
     } ;
 
   copula : Verb = {s = \\_ => "ada"} ; -- TODO