diff --git a/include/picconf.h b/include/picconf.h
index cdd8a51a..e61558f3 100644
--- a/include/picconf.h
+++ b/include/picconf.h
@@ -1,6 +1,9 @@
 #ifndef PICCONF_H__
 #define PICCONF_H__
 
+#define PIC_ARENA_SIZE 1024
+#define PIC_HEAP_SIZE 1024
+
 #define DEBUG 1
 
 #if DEBUG
diff --git a/include/picrin.h b/include/picrin.h
index 7e3a71a9..5632565f 100644
--- a/include/picrin.h
+++ b/include/picrin.h
@@ -12,9 +12,6 @@ struct pic_env {
   struct pic_env *parent;
 };
 
-#define PIC_ARENA_SIZE 1024
-#define PIC_HEAP_SIZE 1024
-
 typedef struct {
   pic_value *sp;
   pic_value *stbase, *stend;