diff --git a/src/main.rs b/src/main.rs
index b64ee4f..6169363 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -315,7 +315,7 @@ fn test_image_from_string() {
 fn image_to_string(image: Image) -> String {
     let mut string = String::new();
 
-    let sqrt = (room.tiles.len() as f64).sqrt() as usize; // 8 for SD, 16 for HD
+    let sqrt = (image.pixels.len() as f64).sqrt() as usize; // 8 for SD, 16 for HD
     for line in image.pixels.chunks(sqrt) {
         for pixel in line {
             string.push_str(&format!("{}", *pixel));