diff --git a/src/test/regress/expected/errors.out b/src/test/regress/expected/errors.out
index 2a6c5ff044ff0f999f02f1a826a133d84a01cb3e..936001de51e50a673b5e0366fe4c460e51588ae3 100644
--- a/src/test/regress/expected/errors.out
+++ b/src/test/regress/expected/errors.out
@@ -197,13 +197,15 @@ drop operator === ();
 ERROR:  syntax error at or near ")" at character 20
 -- no such operator 
 drop operator === (int4);
-ERROR:  argument type missing (use NONE for unary operators)
+ERROR:  missing argument
+HINT:  Use NONE to denote the missing argument of a unary operator.
 -- no such operator by that name 
 drop operator === (int4, int4);
 ERROR:  operator does not exist: integer === integer
 -- no such type1 
 drop operator = (nonesuch);
-ERROR:  argument type missing (use NONE for unary operators)
+ERROR:  missing argument
+HINT:  Use NONE to denote the missing argument of a unary operator.
 -- no such type1 
 drop operator = ( , int4);
 ERROR:  syntax error at or near "," at character 19