diff --git a/internal/data/object.go b/internal/data/object.go
index 11285d3..e2581d4 100644
--- a/internal/data/object.go
+++ b/internal/data/object.go
@@ -135,7 +135,7 @@ func LoadObject(filename string) (*Object, error) {
 		}
 
 		buf := io.LimitReader(f, int64(sprite.PixelSize))
-		sprite.Data = make([]byte, sprite.Height*sprite.Width)
+		sprite.Data = make([]byte, int(sprite.Height)*int(sprite.Width))
 
 		// The pixel data is RLE-compressed. Uncompress it here.
 		if err := rle.Expand(buf, sprite.Data); err != nil {