diff --git a/src/main.c b/src/main.c
index f39a2c1..d8dd15d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,6 +1,7 @@
 #include "img.h"
 #include "mem_arena.h"
 #include "mem_utils.h"
+#include "misc_utils.h"
 #include "obj.h"
 #include "render.h"
 #include "shaders.h"
@@ -21,8 +22,7 @@ enum {
 
 int main(void) {
   Arena *arena = NULL;
-  if (!wapp_mem_arena_init(&arena, 10ul * 1024ul * 1024ul * 1024ul,
-                           WAPP_MEM_ALLOC_RESERVE, false)) {
+  if (!wapp_mem_arena_init(&arena, GB(10), WAPP_MEM_ALLOC_RESERVE, false)) {
     return TINY_EXIT_ARENA_INIT_FAILED;
   }