diff --git a/src/backend/parser/parse_param.c b/src/backend/parser/parse_param.c
index b402843..97064fc 100644
--- a/src/backend/parser/parse_param.c
+++ b/src/backend/parser/parse_param.c
@@ -108,6 +108,9 @@ fixed_paramref_hook(ParseState *pstate, ParamRef *pref)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_PARAMETER),
errmsg("there is no parameter $%d", paramno),
+ parstate->numParams == 1 && < It is of pseudo-type record >
+ ? errhint("%s", _("did you incorrectly enclose USING arguments in parentheses?"))
+ : 0
parser_errposition(pstate, pref->location)));
param = makeNode(Param);
I think a false positive on SQL EXECUTE is going to be very small...but I choose here mostly out of ease - a fix in pl/pgsql would be more correct.