diff --git a/docker/api/image.py b/docker/api/image.py
index 1c1fcde8..a9f801e9 100644
--- a/docker/api/image.py
+++ b/docker/api/image.py
@@ -32,7 +32,7 @@ class ImageApiMixin(object):
         Example:
 
             >>> image = cli.get_image("busybox:latest")
-            >>> f = open('/tmp/busybox-latest.tar', 'w')
+            >>> f = open('/tmp/busybox-latest.tar', 'wb')
             >>> for chunk in image:
             >>>   f.write(chunk)
             >>> f.close()
diff --git a/docker/models/images.py b/docker/models/images.py
index 28b1fd3f..4578c0bd 100644
--- a/docker/models/images.py
+++ b/docker/models/images.py
@@ -84,7 +84,7 @@ class Image(Model):
         Example:
 
             >>> image = cli.get_image("busybox:latest")
-            >>> f = open('/tmp/busybox-latest.tar', 'w')
+            >>> f = open('/tmp/busybox-latest.tar', 'wb')
             >>> for chunk in image:
             >>>   f.write(chunk)
             >>> f.close()