diff --git a/src/libs/antares/include/antares/antares/constants.h b/src/libs/antares/include/antares/antares/constants.h
index d54557e08f..fdc0dbe980 100644
--- a/src/libs/antares/include/antares/antares/constants.h
+++ b/src/libs/antares/include/antares/antares/constants.h
@@ -55,7 +55,7 @@ const unsigned int DAYS_PER_YEAR = 365;
 const unsigned int HOURS_PER_YEAR = 8760;
 
 const unsigned int MONTHS_PER_YEAR = 12;
-const unsigned int WEEKS_PER_YEAR = 12;
+const unsigned int WEEKS_PER_YEAR = 52;
 
 namespace Antares::Constants
 {