1 files changed, 1 insertions, 0 deletions
diff --git a/node.c b/node.c
index 32518d3154..8e2dcdf8b7 100644
--- a/node.c
+++ b/node.c
@@ -947,6 +947,7 @@ rb_gc_mark_node(NODE *obj)
 {
     switch (nd_type(obj)) {
       case NODE_IF:		/* 1,2,3 */
+	rb_gc_mark(obj->nd_refinements); /* use as SVAR */
       case NODE_FOR:
       case NODE_ITER:
       case NODE_WHEN: