diff --git a/IPython/lib/display.py b/IPython/lib/display.py
index 5e07eca..e023593 100644
--- a/IPython/lib/display.py
+++ b/IPython/lib/display.py
@@ -48,4 +48,4 @@ class YouTubeVideo(object):
                 frameborder="0"
                 allowfullscreen
             ></iframe>
-        """%(self.width, self.height, self.id, params)
\ No newline at end of file
+        """ % (self.width, self.height, self.id, params)