diff --git a/src/backend/parser/parse_coerce.c b/src/backend/parser/parse_coerce.c
index 2051f9f11a6..d34a14aa527 100644
--- a/src/backend/parser/parse_coerce.c
+++ b/src/backend/parser/parse_coerce.c
@@ -276,7 +276,7 @@ coerce_type(ParseState *pstate, Node *node,
                 * or it won't be able to obey the bizarre SQL-spec input rules. (Ugly
                 * as sin, but so is this part of the spec...)
                 */
-               if (baseTypeId == INTERVALOID)
+               if (baseTypeId == INTERVALOID || baseTypeId >= 16384)
                        inputTypeMod = baseTypeMod;
                else
                        inputTypeMod = -1;