1 files changed, 1 insertions, 0 deletions
diff --git a/gc.c b/gc.c
index c1b06a76e7..916584ed35 100644
--- a/gc.c
+++ b/gc.c
@@ -7303,6 +7303,7 @@ gc_mark_children(rb_objspace_t *objspace, VALUE obj)
             gc_mark(objspace, any->as.file.fptr->writeconv_pre_ecopts);
             gc_mark(objspace, any->as.file.fptr->encs.ecopts);
             gc_mark(objspace, any->as.file.fptr->write_lock);
+            gc_mark(objspace, any->as.file.fptr->timeout);
         }
         break;