1 files changed, 2 insertions, 0 deletions
diff --git a/src/gc.c b/src/gc.c
index 105713a3d..9ecb0615d 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -334,8 +334,10 @@ mrb_init_heap(mrb_state *mrb)
   add_heap(mrb);
   mrb->gc_interval_ratio = DEFAULT_GC_INTERVAL_RATIO;
   mrb->gc_step_ratio = DEFAULT_GC_STEP_RATIO;
+#ifndef MRB_GC_TURN_OFF_GENERATIONAL
   mrb->is_generational_gc_mode = TRUE;
   mrb->gc_full = TRUE;
+#endif
 
 #ifdef GC_PROFILE
   program_invoke_time = gettimeofday_time();