diff --git a/newspaper/images.py b/newspaper/images.py
index 54e5b1e1..79fbccbd 100644
--- a/newspaper/images.py
+++ b/newspaper/images.py
@@ -195,7 +195,7 @@ def largest_image_url(self):
             if area > max_area:
                 max_area = area
                 max_url = img_url
-        log.debug('using max img ' + max_url)
+        log.debug('using max img {}'.format(max_url))
         return max_url
 
     def calculate_area(self, img_url, dimension):