diff --git a/lib/Dither.dart b/lib/Dither.dart
index 7f1cdb9..b51e2ea 100644
--- a/lib/Dither.dart
+++ b/lib/Dither.dart
@@ -81,7 +81,7 @@ class PixelArray {
     pixels = new List(height);
     for (int y = 0; y < height; y++) {
       pixels[y] = new List(width);
-      for (int x = 0; x < height; x++) {
+      for (int x = 0; x < width; x++) {
         pixels[y][x] = new Pixel(x, y, 0, 0, 0, 0);
       }
     }