1 files changed, 1 insertions, 1 deletions
diff --git a/gc.c b/gc.c
index fd84749dd5..a4f5c355e7 100644
--- a/gc.c
+++ b/gc.c
@@ -204,7 +204,7 @@ static ruby_gc_params_t gc_params = {
  * 4: show all references
  */
 #ifndef RGENGC_CHECK_MODE
-#define RGENGC_CHECK_MODE  0
+#define RGENGC_CHECK_MODE  3
 #endif
 
 /* RGENGC_PROFILE