diff --git a/src/world.rs b/src/world.rs
index 7e334ae..d8c9dc4 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -366,9 +366,9 @@ fn test_world_serialization() {
         .init();
     let mut w = World::new(WorldPos { x: 0, y: 0 }, "smoltestworld");
     let wg = Worldgen::from_seed(0);
-    for y in 0..820 {
-        for x in 0..820 {
-            w.tile_at_mut(TilePos { x, y }, &wg).mid = (x + y) as u16;
+    for y in 0..400 {
+        for x in 0..400 {
+            w.tile_at_mut(TilePos { x, y }, &wg).mid = 1;
         }
     }
     w.save();