diff --git a/src/saveload/afterload.cpp b/src/saveload/afterload.cpp
index ed6a91a2e1..c91d8ee29d 100644
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -3320,7 +3320,7 @@ bool AfterLoadGame()
 		ScriptObject::InitializeRandomizers();
 	}
 
-	if (IsSavegameVersionBefore(SLV_COMPANY_INAUGURATED_PERIOD)) {
+	if (IsSavegameVersionBefore(SLV_COMPANY_INAUGURATED_PERIOD_V2)) {
 		for (Company *c : Company::Iterate()) {
 			c->inaugurated_year_calendar = _settings_game.game_creation.starting_year;
 		}
diff --git a/src/saveload/company_sl.cpp b/src/saveload/company_sl.cpp
index 03ccde9bc9..50c65469d1 100644
--- a/src/saveload/company_sl.cpp
+++ b/src/saveload/company_sl.cpp
@@ -490,6 +490,7 @@ static const SaveLoad _company_desc[] = {
 	SLE_CONDVAR(CompanyProperties, last_build_coordinate, SLE_UINT32,                  SLV_6, SL_MAX_VERSION),
 	SLE_CONDVAR(CompanyProperties, inaugurated_year,      SLE_FILE_U8  | SLE_VAR_I32,  SL_MIN_VERSION, SLV_31),
 	SLE_CONDVAR(CompanyProperties, inaugurated_year,      SLE_INT32,                  SLV_31, SL_MAX_VERSION),
+	SLE_CONDVAR(CompanyProperties, inaugurated_year_calendar, SLE_INT32,               SLV_COMPANY_INAUGURATED_PERIOD_V2, SL_MAX_VERSION),
 
 	SLE_CONDVAR(CompanyProperties, num_valid_stat_ent,    SLE_UINT8,                   SL_MIN_VERSION, SLV_SAVELOAD_LIST_LENGTH),
 
diff --git a/src/saveload/saveload.h b/src/saveload/saveload.h
index aa23f4b93d..83255abd43 100644
--- a/src/saveload/saveload.h
+++ b/src/saveload/saveload.h
@@ -395,6 +395,7 @@ enum SaveLoadVersion : uint16_t {
 	SLV_PATH_CACHE_FORMAT,                  ///< 346  PR#12345 Vehicle path cache format changed.
 	SLV_ANIMATED_TILE_STATE_IN_MAP,         ///< 347  PR#13082 Animated tile state saved for improved performance.
 	SLV_INCREASE_HOUSE_LIMIT,               ///< 348  PR#12288 Increase house limit to 4096.
+	SLV_COMPANY_INAUGURATED_PERIOD_V2,      ///< 349  PR#13448 Fix savegame storage for company inaugurated year in wallclock mode.
 
 	SL_MAX_VERSION,                         ///< Highest possible saveload version
 };