diff --git a/lib/compass/sass_extensions/sprites/engines/chunky_png_engine.rb b/lib/compass/sass_extensions/sprites/engines/chunky_png_engine.rb
index de720221..dd7a6455 100644
--- a/lib/compass/sass_extensions/sprites/engines/chunky_png_engine.rb
+++ b/lib/compass/sass_extensions/sprites/engines/chunky_png_engine.rb
@@ -17,7 +17,7 @@ module Compass
             if image.repeat == "no-repeat"
               output_png.replace! input_png, image.left, image.top
             else
-              x = image.left - (image.left / image.width).floor * image.width
+              x = image.left - (image.left / image.width).ceil * image.width
               while x < width do
                 begin
                   output_png.replace! input_png, x, image.top