diff --git a/src/backend/nodes/nodeFuncs.c b/src/backend/nodes/nodeFuncs.c
index d6f1f5b..843f06d 100644
--- a/src/backend/nodes/nodeFuncs.c
+++ b/src/backend/nodes/nodeFuncs.c
@@ -1933,6 +1933,8 @@ expression_tree_walker(Node *node,
 			return walker(((PlaceHolderInfo *) node)->ph_var, context);
 		case T_RangeTblFunction:
 			return walker(((RangeTblFunction *) node)->funcexpr, context);
+		case T_RestrictInfo:
+			return walker(((RestrictInfo *) node)->clause, context);
 		default:
 			elog(ERROR, "unrecognized node type: %d",
 				 (int) nodeTag(node));