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-rw-r--r--src/alloc.c1
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;