diff --git a/src/config.h b/src/config.h
new file mode 100644
index 00000000..8387f4fd
--- /dev/null
+++ b/src/config.h
@@ -0,0 +1,7 @@
+/* configurations for Picrin interpreter */
+
+#define PIC_ARENA_SIZE (8 * 1024)
+
+#define PIC_HEAP_PAGE_SIZE (2 * 1024 * 1024)
+
+#define PIC_SYM_POOL_SIZE (2 * 1024)
diff --git a/src/main.c b/src/main.c
index 33eb7cf4..ebbef40a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2,6 +2,8 @@
  * See Copyright Notice in picrin.h
  */
 
+#include "config.h"
+
 #include "picrin.h"
 #include "picrin/pair.h"
 #include "picrin/error.h"