diff --git a/src/twomartens/masterthesis/cli.py b/src/twomartens/masterthesis/cli.py
index dda77da..74ac680 100644
--- a/src/twomartens/masterthesis/cli.py
+++ b/src/twomartens/masterthesis/cli.py
@@ -154,7 +154,7 @@ def _ssd_train(args: argparse.Namespace) -> None:
     )
     
     with open(f"{args.summary_path}/train/{args.network}/{args.iteration}/history", "wb") as file:
-        pickle.dump(history, file)
+        pickle.dump(history.history, file)
 
 
 def _auto_encoder_train(args: argparse.Namespace) -> None: