diff --git a/src/lib/py/helpers.py b/src/lib/py/helpers.py
index 97cca55..ed6f5cf 100644
--- a/src/lib/py/helpers.py
+++ b/src/lib/py/helpers.py
@@ -718,8 +718,8 @@ def label_worker(dataset, start, end):
         final_n_labels = lib_connected_components.merge_labeled_chunks(labels, np.array(n_labels), (n_chunks, layers_per_chunk, ny, nx), verbose)
 
         if plotting:
-            plot_middle_planes(labels, plotting_dir, 'labeled', verbose)
-            plot_middle_planes(labels > 0, plotting_dir, 'labeled_binary', verbose)
+            plot_middle_planes(labels, plotting_dir, 'labeled', verbose=verbose)
+            plot_middle_planes(labels > 0, plotting_dir, 'labeled_binary', verbose=verbose)
 
         # TODO use lib_general.bincount at some point.
         bincounts = np.bincount(labels[labels > 0], minlength=final_n_labels+1)