diff --git a/addons/rating/models/rating.py b/addons/rating/models/rating.py
index 5825c284ca1..67360ffd3d3 100644
--- a/addons/rating/models/rating.py
+++ b/addons/rating/models/rating.py
@@ -69,7 +69,7 @@ class Rating(models.Model):
         for rating in self:
             try:
                 image_path = get_resource_path('rating', 'static/src/img', 'rating_%s.png' % (int(rating.rating),))
-                rating.rating_image = base64.b64decode(open(image_path, 'rb').read())
+                rating.rating_image = base64.b64encode(open(image_path, 'rb').read())
             except (IOError, OSError):
                 rating.rating_image = False