1 files changed, 1 insertions, 0 deletions
diff --git a/marshal.c b/marshal.c
index 7acc495ca2..a0f9d76edb 100644
--- a/marshal.c
+++ b/marshal.c
@@ -166,6 +166,7 @@ mark_dump_arg(void *ptr)
         return;
     rb_mark_set(p->data);
     rb_mark_hash(p->compat_tbl);
+    rb_gc_mark(p->str);
 }
 
 static void