1 files changed, 1 insertions, 0 deletions

diff --git a/src/alloc.c b/src/alloc.c
index b0c120bad81..6aaa34dfc21 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -1609,6 +1609,7 @@ mark_object (objptr)
     case Lisp_Cons:
     case Lisp_Buffer_Local_Value:
     case Lisp_Some_Buffer_Local_Value:
+    case Lisp_Overlay:
       {
         register struct Lisp_Cons *ptr = XCONS (obj);
         if (XMARKBIT (ptr->car)) break;