1 files changed, 1 insertions, 1 deletions
diff --git a/vm.c b/vm.c
index 4ffc8c8817..f7aec06234 100644
--- a/vm.c
+++ b/vm.c
@@ -1396,7 +1396,7 @@ rb_vm_mark(void *ptr)
 	RUBY_MARK_UNLESS_NULL(vm->loaded_features);
 	RUBY_MARK_UNLESS_NULL(vm->top_self);
 	RUBY_MARK_UNLESS_NULL(vm->coverages);
-	rb_gc_mark_locations(vm->special_exceptions, vm->special_exceptions + ruby_special_error_count - 1);
+	rb_gc_mark_locations(vm->special_exceptions, vm->special_exceptions + ruby_special_error_count);
 
 	if (vm->loading_table) {
 	    rb_mark_tbl(vm->loading_table);