diff --git a/PIL/Image.py b/PIL/Image.py
index 368186f81..4fd2dcfc7 100644
--- a/PIL/Image.py
+++ b/PIL/Image.py
@@ -997,7 +997,7 @@ class Image(object):
                     "only RGB or L mode images can be quantized to a palette"
                     )
             im = self.im.convert("P", 1, palette.im)
-            return self._makeself(im)
+            return self._new(im)
 
         return self._new(self.im.quantize(colors, method, kmeans))