diff --git a/wda/__init__.py b/wda/__init__.py
index 26cfb4d..ab45d80 100644
--- a/wda/__init__.py
+++ b/wda/__init__.py
@@ -562,7 +562,8 @@ def screenshot(self, png_filename=None, format='pillow'):
         elif format == 'pillow':
             from PIL import Image
             buff = io.BytesIO(raw_value)
-            return Image.open(buff)
+            im = Image.open(buff)
+            return im.convert("RGB") # convert to RGB to fix save jpeg error
         else:
             raise ValueError("unknown format")