diff --git a/swash/processing/sws_npz.py b/swash/processing/sws_npz.py
index 8db2eda..607066b 100644
--- a/swash/processing/sws_npz.py
+++ b/swash/processing/sws_npz.py
@@ -22,6 +22,7 @@ config.read(args.config)
 
 sws_out = pathlib.Path(config.get("swash", "out"))
 inp = pathlib.Path(config.get("post", "inp"))
+inp.mkdir(parents=True, exist_ok=True)
 
 log.info(f"Reading swash output from '{sws_out}'")
 rsws = ReadSwash()
@@ -39,7 +40,6 @@ var = {
     "vz": rsws.read_scalar_lay,
 }
 
-inp.mkdir(parents=True, exist_ok=True)
 with ThreadPool() as pool:
     log.info("Converting all data")
     pool.map(