diff --git a/world.js b/world.js
index 50fc4d3..3291f1f 100644
--- a/world.js
+++ b/world.js
@@ -88,7 +88,7 @@ function makeChunk(z, x) {
 }
 
 export function blockLookup(world, x, y, z) {
-    if (y < 0.5 || z > 255.5) {
+    if (y < 0.5 || y > 255.5) {
         return {
             type: BlockType.UNDEFINED,
         }