1 files changed, 3 insertions, 3 deletions
diff --git a/src/gc.c b/src/gc.c
index 6fcac6c2f..d3fc6d5a2 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -582,8 +582,8 @@ gc_mark_children(mrb_state *mrb, struct RBasic *obj)
 
   case MRB_TT_EXCEPTION:
     mrb_gc_mark_iv(mrb, (struct RObject*)obj);
-    if ((obj->flags & MRB_EXC_MESG_INIT_FLAG) != 0) {
-      mrb_gc_mark_value(mrb, ((struct RException*)obj)->mesg);
+    if ((obj->flags & MRB_EXC_MESG_STRING_FLAG) != 0) {
+      mrb_gc_mark(mrb, (struct RBasic*)((struct RException*)obj)->mesg);
     }
     break;
 
@@ -808,7 +808,7 @@ gc_gray_mark(mrb_state *mrb, struct RBasic *obj)
 
   case MRB_TT_EXCEPTION:
     children += mrb_gc_mark_iv_size(mrb, (struct RObject*)obj);
-    if ((obj->flags & MRB_EXC_MESG_INIT_FLAG) != 0) {
+    if ((obj->flags & MRB_EXC_MESG_STRING_FLAG) != 0) {
       children++;
     }
     break;