diff --git a/openerp/tools/image.py b/openerp/tools/image.py
index e53ee879f58..f1293b52fff 100644
--- a/openerp/tools/image.py
+++ b/openerp/tools/image.py
@@ -183,7 +183,7 @@ def image_colorize(original, randomize=True, color=(255, 255, 255)):
     # generate the background color, past it as background
     if randomize:
         color = (randint(32, 224), randint(32, 224), randint(32, 224))
-    image.paste(color)
+    image.paste(color, box=(0, 0) + original.size)
     image.paste(original, mask=original)
     # return the new image
     buffer = StringIO.StringIO()