diff --git a/src/calibre/customize/profiles.py b/src/calibre/customize/profiles.py
index 85eae21b8d..1563f764ca 100644
--- a/src/calibre/customize/profiles.py
+++ b/src/calibre/customize/profiles.py
@@ -426,7 +426,7 @@ class KoboReaderOutput(OutputProfile):
 
     description = _('This profile is intended for the Kobo Reader.')
 
-    screen_size               = (590, 775)
+    screen_size               = (540, 718)
     comic_screen_size         = (540, 718)
     dpi                       = 168.451
     fbase                     = 12