1 files changed, 1 insertions, 0 deletions
diff --git a/parse.y b/parse.y
index 4303bea5b2..f3319d18e1 100644
--- a/parse.y
+++ b/parse.y
@@ -10824,6 +10824,7 @@ parser_mark(void *ptr)
     rb_gc_mark(parser->result);
     rb_gc_mark(parser->parsing_thread);
 #endif
+    rb_gc_mark(parser->debug_buffer);
 #ifdef YYMALLOC
     rb_gc_mark((VALUE)parser->heap);
 #endif