diff --git a/swash/processing/sws_npz.py b/swash/processing/sws_npz.py
index 24581b0..4768472 100644
--- a/swash/processing/sws_npz.py
+++ b/swash/processing/sws_npz.py
@@ -28,7 +28,7 @@ bathy = pd.read_hdf(data_out.joinpath("bathy.h5"), "bathy")
 n_x = bathy.index.size
 
 log.info(f"Reading swash output from '{sws_out}'")
-botl_np = read_nohead_scalar(sws_out.joinpath("botl.dat"), n_x)
+botl = read_nohead_scalar(sws_out.joinpath("botl.dat"), n_x)
 dep = np.maximum(0, read_nohead_scalar(sws_out.joinpath("dep.dat"), n_x))
 vel = read_nohead_vect(sws_out.joinpath("vel.dat"), n_x)