diff --git a/augur/argparse_.py b/augur/argparse_.py
index 56013a2d0..670a35322 100644
--- a/augur/argparse_.py
+++ b/augur/argparse_.py
@@ -2,7 +2,7 @@
 Custom helpers for the argparse standard library.
 """
 import argparse
-from argparse import Action, ArgumentDefaultsHelpFormatter
+from argparse import Action
 
 
 # Include this in an argument help string to suppress the automatic appending