diff --git a/src/src_python/antares_xpansion/xpansionConfig.py b/src/src_python/antares_xpansion/xpansionConfig.py
index 26f342b49..b98736950 100644
--- a/src/src_python/antares_xpansion/xpansionConfig.py
+++ b/src/src_python/antares_xpansion/xpansionConfig.py
@@ -73,7 +73,7 @@ def __init__(self, configfile: Path):
         args = parser.parse_args()
         self.step = args.step
         self.simulationName = args.simulationName
-        self.dataDir = args.dataDir
+        self.dataDir = str(Path(args.dataDir).resolve())
         self.installDir = args.installDir
         self.method = args.method
         self.c = args.c