diff --git a/src/droplet_growth/poisson.py b/src/droplet_growth/poisson.py
index cdf74b70972a7f6e279c4dae8cb416aadcc38ea3..aca350a10e1b5dba9354dc61fdfb69b1dea76c96 100644
--- a/src/droplet_growth/poisson.py
+++ b/src/droplet_growth/poisson.py
@@ -25,5 +25,5 @@ def fit(numbers:np.ndarray, max_value=None, xlabel='Initial number of cells',
                 print(f'Save histogram {save_fig_path}')
             except Exception as e:
                 print('saving histogram failed', e.args)
-        # plt.show()
+        plt.close()
     return l