1 files changed, 1 insertions, 0 deletions
diff --git a/set.c b/set.c
index ed0ace4224..6dbfd535cf 100644
--- a/set.c
+++ b/set.c
@@ -528,6 +528,7 @@ set_i_initialize_copy(VALUE set, VALUE other)
 
     set_free_embedded(sobj);
     set_copy(&sobj->table, RSET_TABLE(other));
+    rb_gc_writebarrier_remember(set);
 
     return set;
 }