diff --git a/PIL/IcoImagePlugin.py b/PIL/IcoImagePlugin.py
index 5dbf31f9f..195bbe42e 100644
--- a/PIL/IcoImagePlugin.py
+++ b/PIL/IcoImagePlugin.py
@@ -46,8 +46,9 @@ def _save(im, fp, filename):
                                [(16, 16), (24, 24), (32, 32), (48, 48),
                                 (64, 64), (128, 128), (256, 256)])
     width, height = im.size
-    filter(lambda x: False if (x[0] > width or x[1] > height or
-                               x[0] > 256 or x[1] > 256) else True, sizes)
+    sizes = filter(lambda x: False if (x[0] > width or x[1] > height or
+                                       x[0] > 256 or x[1] > 256) else True,
+                   sizes)
     fp.write(struct.pack("<H", len(sizes)))  # idCount(2)
     offset = fp.tell() + len(sizes)*16
     for size in sizes: