diff --git a/src/openrct2/management/Marketing.h b/src/openrct2/management/Marketing.h
index 6d4df0ebde..36c931754b 100644
--- a/src/openrct2/management/Marketing.h
+++ b/src/openrct2/management/Marketing.h
@@ -36,6 +36,7 @@ enum
 
 enum
 {
+    CAMPAIGN_FIRST_WEEK_FLAG = (1 << 6),
     CAMPAIGN_ACTIVE_FLAG = (1 << 7)
 };
 
diff --git a/src/openrct2/rct2/S6Exporter.cpp b/src/openrct2/rct2/S6Exporter.cpp
index 1772a19fb2..e5a3d286a5 100644
--- a/src/openrct2/rct2/S6Exporter.cpp
+++ b/src/openrct2/rct2/S6Exporter.cpp
@@ -795,6 +795,8 @@ void S6Exporter::ExportMarketingCampaigns()
     for (const auto& campaign : gMarketingCampaigns)
     {
         _s6.campaign_weeks_left[campaign.Type] = campaign.WeeksLeft | CAMPAIGN_ACTIVE_FLAG;
+        if ((campaign.Flags & MarketingCampaignFlags::FIRST_WEEK))
+            _s6.campaign_weeks_left[campaign.Type] |= CAMPAIGN_FIRST_WEEK_FLAG;
         if (campaign.Type == ADVERTISING_CAMPAIGN_RIDE_FREE || campaign.Type == ADVERTISING_CAMPAIGN_RIDE)
         {
             _s6.campaign_ride_index[campaign.Type] = campaign.RideId;
diff --git a/src/openrct2/rct2/S6Importer.cpp b/src/openrct2/rct2/S6Importer.cpp
index 994070cb4d..2ce88cd597 100644
--- a/src/openrct2/rct2/S6Importer.cpp
+++ b/src/openrct2/rct2/S6Importer.cpp
@@ -1072,7 +1072,11 @@ public:
             {
                 MarketingCampaign campaign{};
                 campaign.Type = (uint8_t)i;
-                campaign.WeeksLeft = _s6.campaign_weeks_left[i] & ~CAMPAIGN_ACTIVE_FLAG;
+                campaign.WeeksLeft = _s6.campaign_weeks_left[i] & ~(CAMPAIGN_ACTIVE_FLAG | CAMPAIGN_FIRST_WEEK_FLAG);
+                if ((_s6.campaign_weeks_left[i] & CAMPAIGN_FIRST_WEEK_FLAG) != 0)
+                {
+                    campaign.Flags |= MarketingCampaignFlags::FIRST_WEEK;
+                }
                 if (campaign.Type == ADVERTISING_CAMPAIGN_RIDE_FREE || campaign.Type == ADVERTISING_CAMPAIGN_RIDE)
                 {
                     campaign.RideId = _s6.campaign_ride_index[i];