diff --git a/lib/matplotlib/animation.py b/lib/matplotlib/animation.py
index fa03f90d7ad8..b260ed0686be 100644
--- a/lib/matplotlib/animation.py
+++ b/lib/matplotlib/animation.py
@@ -267,7 +267,7 @@ def __init__(self, fps=5, codec=None, bitrate=None, extra_args=None,
     def frame_size(self):
         'A tuple (width,height) in pixels of a movie frame.'
         w, h = self.fig.get_size_inches()
-        return int(w * self.dpi), int(h * self.dpi)
+        return round(w * self.dpi), round(h * self.dpi)
 
     def _adjust_frame_size(self):
         if self.codec == 'h264':