diff --git a/src/texture.rs b/src/texture.rs
index 01655d6..71d72a0 100644
--- a/src/texture.rs
+++ b/src/texture.rs
@@ -117,7 +117,7 @@ impl TextureDescriptorRef {
             height,
             depth,
         } = size;
-        let count = (width.max(height).max(depth) as f64).log2().ceil() as u64;
+        let count = (width.max(height).max(depth) as f64).log2().ceil() as _;
         self.set_mipmap_level_count(count);
     }