diff --git a/alignementseq_tests.py b/alignementseq_tests.py
index 2a3c2f157ddda2e2fd6cdc296040477cbc0ff82b..6a5db6e5e3aafa19326984a7aa074cd3517b8e3d 100755
--- a/alignementseq_tests.py
+++ b/alignementseq_tests.py
@@ -8,6 +8,8 @@ import warnings
 import timeit
 import multiprocessing
 import pandas as pd
+import matplotlib
+matplotlib.use('Agg')
 import matplotlib.pyplot
 
 import Bio.SeqIO