diff --git a/src/backend/optimizer/path/equivclass.c b/src/backend/optimizer/path/equivclass.c
index 70a925c..e8cdea5 100644
--- a/src/backend/optimizer/path/equivclass.c
+++ b/src/backend/optimizer/path/equivclass.c
@@ -497,8 +497,9 @@ canonicalize_ec_expression(Expr *expr, Oid req_type, Oid req_collation)
 
 	/*
 	 * For a polymorphic-input-type opclass, just keep the same exposed type.
+	 * RECORD opclasses work like polymorphic types for this purpose.
 	 */
-	if (IsPolymorphicType(req_type))
+	if (IsPolymorphicType(req_type) || req_type == RECORDOID)
 		req_type = expr_type;
 
 	/*