1 files changed, 1 insertions, 0 deletions
diff --git a/src/gc.c b/src/gc.c
index c75a0f9aa..225ca095c 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -857,6 +857,7 @@ root_scan_phase(mrb_state *mrb, mrb_gc *gc)
   mrb_gc_mark(mrb, (struct RBasic*)mrb->top_self);
   /* mark exception */
   mrb_gc_mark(mrb, (struct RBasic*)mrb->exc);
+  mrb_gc_mark(mrb, (struct RBasic*)mrb->backtrace.exc);
   /* mark pre-allocated exception */
   mrb_gc_mark(mrb, (struct RBasic*)mrb->nomem_err);
 #ifdef MRB_GC_FIXED_ARENA