diff --git a/aucmedi/ensemble/bagging.py b/aucmedi/ensemble/bagging.py
index 1838145e..3f8c09f7 100644
--- a/aucmedi/ensemble/bagging.py
+++ b/aucmedi/ensemble/bagging.py
@@ -48,7 +48,7 @@ def __init__(self, model, k_fold=3):
         self.cache_dir = None
 
         # Set multiprocessing method to spawn
-        mp.set_start_method("spawn")
+        mp.set_start_method("spawn", force=True)
 
 
     def train(self, training_generator, epochs=20, iterations=None,