diff --git a/extlib/benz/gc.c b/extlib/benz/gc.c
index d85d5957..b76f6d3c 100644
--- a/extlib/benz/gc.c
+++ b/extlib/benz/gc.c
@@ -36,7 +36,7 @@ struct object {
   } u;
 };
 
-#if !PIC_USE_BITMAPGC
+#if !PIC_BITMAP_GC
 
 struct heap {
   union header base, *freep;
@@ -76,7 +76,7 @@ pic_heap_open(pic_state *pic)
 
   heap = pic_malloc(pic, sizeof(struct heap));
 
-#if !PIC_USE_BITMAPGC
+#if !PIC_BITMAP_GC
   heap->base.s.ptr = &heap->base;
   heap->base.s.size = 0; /* not 1, since it must never be used for allocation */
   heap->freep = &heap->base;
@@ -198,7 +198,7 @@ pic_alloca(pic_state *pic, size_t n)
 
 /* MARK */
 
-#if !PIC_USE_BITMAPGC
+#if !PIC_BITMAP_GC
 
 static bool
 is_marked(pic_state *PIC_UNUSED(pic), struct object *obj)
@@ -602,7 +602,7 @@ gc_finalize_object(pic_state *pic, struct object *obj)
   }
 }
 
-#if !PIC_USE_BITMAPGC
+#if !PIC_BITMAP_GC
 
 static void *
 heap_alloc(pic_state *pic, size_t size)
@@ -852,7 +852,7 @@ gc_sweep_phase(pic_state *pic)
 void
 gc_init(pic_state *PIC_UNUSED(pic))
 {
-#if PIC_USE_BITMAPGC
+#if PIC_BITMAP_GC
   struct heap_page *page;
 
   page = pic->heap->pages;
@@ -899,7 +899,7 @@ pic_obj_alloc_unsafe(pic_state *pic, size_t size, int type)
 	pic_panic(pic, "GC memory exhausted");
     }
   }
-#if !PIC_USE_BITMAPGC
+#if !PIC_BITMAP_GC
   obj->u.basic.gc_mark = 0;
 #endif
   obj->u.basic.tt = type;
diff --git a/extlib/benz/include/picrin/private/object.h b/extlib/benz/include/picrin/private/object.h
index 20633abf..9597fa7c 100644
--- a/extlib/benz/include/picrin/private/object.h
+++ b/extlib/benz/include/picrin/private/object.h
@@ -17,7 +17,7 @@ KHASH_DECLARE(env, struct identifier *, symbol *)
 KHASH_DECLARE(dict, symbol *, pic_value)
 KHASH_DECLARE(weak, struct object *, pic_value)
 
-#if PIC_USE_BITMAPGC
+#if PIC_BITMAP_GC
 # define OBJECT_HEADER                           \
   unsigned char tt;
 #else
diff --git a/extlib/benz/include/picrin/setup.h b/extlib/benz/include/picrin/setup.h
index ad185e00..8c43c9a1 100644
--- a/extlib/benz/include/picrin/setup.h
+++ b/extlib/benz/include/picrin/setup.h
@@ -464,5 +464,5 @@ double PIC_CSTRING_TO_DOUBLE(const char *);
 #if PIC_USE_LIBC && (defined (__unix__) || (defined (__APPLE__) && defined (__MACH__)))
 # include <unistd.h>
 # define PIC_MEMALIGN(pic, buf, alignment, size) posix_memalign(buf, alignment, size)
-# define PIC_USE_BITMAPGC 1
+# define PIC_BITMAP_GC 1
 #endif