diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
index f4ba5c06dcb3..4f94687e02e9 100644
--- a/lib/matplotlib/dates.py
+++ b/lib/matplotlib/dates.py
@@ -726,7 +726,7 @@ def strftime(self, dt, fmt=None):
         fmt = fmt.replace("%s", "s")
         if dt.year >= 1900:
             # Note: in python 3.3 this is okay for years >= 1000,
-            # refer to http://bugs.python.org/issue177742
+            # refer to http://bugs.python.org/issue1777412
             return cbook.unicode_safe(dt.strftime(fmt))
 
         return self.strftime_pre_1900(dt, fmt)