diff --git a/xmip/postprocessing.py b/xmip/postprocessing.py
index 71c76c31..43145b2a 100644
--- a/xmip/postprocessing.py
+++ b/xmip/postprocessing.py
@@ -4,8 +4,6 @@
 
 from typing import List, Mapping
 
-from typing import List, Mapping
-
 import numpy as np
 import xarray as xr