diff --git a/imagekit/utils.py b/imagekit/utils.py
index 3ed7ce9..af8d40f 100644
--- a/imagekit/utils.py
+++ b/imagekit/utils.py
@@ -4,6 +4,6 @@ import tempfile
 
 def img_to_fobj(img, format, **kwargs):
     tmp = tempfile.TemporaryFile()
-    img.save(tmp, format, **kwargs)
+    img.convert('RGB').save(tmp, format, **kwargs)
     tmp.seek(0)
     return tmp