diff --git a/swash/config-nb.ini b/swash/config-nb.ini
index 11f2cc2..33812d4 100644
--- a/swash/config-nb.ini
+++ b/swash/config-nb.ini
@@ -8,7 +8,7 @@ out=out/spec_nb
 mpi=8
 
 [post]
-inp=inp_post
+inp=inp_post/spec_nb
 compare=inp_post_nb
 out=out_post
 #nperseg=1024
diff --git a/swash/config.ini b/swash/config.ini
index 9bf00a7..b7947c4 100644
--- a/swash/config.ini
+++ b/swash/config.ini
@@ -8,7 +8,7 @@ out=out/spec
 mpi=8
 
 [post]
-inp=inp_post
+inp=inp_post/spec
 compare=inp_post_nb
 out=out_post
 #nperseg=1024
diff --git a/swash/processing/sws_npz.py b/swash/processing/sws_npz.py
index 3c971ab..516e3a5 100644
--- a/swash/processing/sws_npz.py
+++ b/swash/processing/sws_npz.py
@@ -39,7 +39,7 @@ var = {
     "vz": rsws.read_scalar_lay,
 }
 
-inp.mkdir(exist_ok=True)
+inp.mkdir(parents=True, exist_ok=True)
 with ThreadPool() as pool:
     log.info("Converting all data")
     pool.map(