diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
index 2c1f73547ba2..04c5da0f0996 100755
--- a/lib/matplotlib/dates.py
+++ b/lib/matplotlib/dates.py
@@ -707,7 +707,7 @@ def __call__(self, x, pos=None):
elif six.callable(fmt):
result = fmt(x, pos)
else:
- raise TypeError('Unexpected type passed to {!r}.'.formatter(self))
+ raise TypeError('Unexpected type passed to {0!r}.'.format(self))
return result
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