diff --git a/client/packhand.cpp b/client/packhand.cpp
index 50fb49177c..e975d5d0d5 100644
--- a/client/packhand.cpp
+++ b/client/packhand.cpp
@@ -791,7 +791,7 @@ void handle_city_info(const struct packet_city_info *packet)
 
   pcity->airlift = packet->airlift;
   pcity->did_buy = packet->did_buy;
-  pcity->did_buy_production = packet->did_buy_production;
+  pcity->bought_shields = packet->bought_shields;
   pcity->did_sell = packet->did_sell;
   pcity->was_happy = packet->was_happy;
 
diff --git a/common/city.cpp b/common/city.cpp
index da2ea65d8b..6852cd32ba 100644
--- a/common/city.cpp
+++ b/common/city.cpp
@@ -1828,12 +1828,12 @@ int city_change_production_penalty(const struct city *pcity,
     penalized_shields = pcity->before_change_shields;
   }
 
-  // Penalize 50% if you buy unit last turn but didnt built
-  if ((pcity->did_buy_production
+  // Penalize 50% if you bought a unit but didn't build it
+  if ((pcity->bought_shields > 0
        && ((target->kind == VUT_UTYPE
             && target->value.utype != pcity->changed_from.value.utype)))) {
-    unpenalized_shields = 0;
-    penalized_shields = pcity->before_change_shields;
+    unpenalized_shields -= pcity->bought_shields;
+    penalized_shields += pcity->bought_shields;
   }
 
   /* Do not put penalty on these. It shouldn't matter whether you disband
@@ -1848,6 +1848,7 @@ int city_change_production_penalty(const struct city *pcity,
     penalized_shields += pcity->caravan_shields;
   }
 
+  qCritical() << unpenalized_shields << penalized_shields;
   shield_stock_after_adjustment =
       unpenalized_shields + penalized_shields / 2;
 
@@ -3329,7 +3330,7 @@ struct city *create_city_virtual(struct player *pplayer, struct tile *ptile,
 
   pcity->turn_plague = -1; // -1 = never
   pcity->did_buy = false;
-  pcity->did_buy_production = false;
+  pcity->bought_shields = 0;
   pcity->city_radius_sq = game.info.init_city_radius_sq;
   pcity->turn_founded = game.info.turn;
   pcity->turn_last_built = game.info.turn;
diff --git a/common/city.h b/common/city.h
index 7781e22f73..1cd3577e61 100644
--- a/common/city.h
+++ b/common/city.h
@@ -339,8 +339,8 @@ struct city {
 
   // turn states
   int airlift;
+  int bought_shields;
   bool did_buy;
-  bool did_buy_production;
   bool did_sell;
   bool was_happy;
 
diff --git a/common/networking/packets.def b/common/networking/packets.def
index eee9084433..e14bcb2b83 100644
--- a/common/networking/packets.def
+++ b/common/networking/packets.def
@@ -730,9 +730,12 @@ PACKET_CITY_INFO = 31; sc, lsend, is-game-info, force, cancel(PACKET_CITY_SHORT_
   UINT16 disbanded_shields;
   UINT16 caravan_shields;
   UINT16 last_turns_shield_surplus;
+  UINT16 bought_shields; add-cap(bought-shields)
 
   UINT8 airlift;
-  BOOL did_buy, did_buy_production, did_sell, was_happy;
+  BOOL did_buy;
+  BOOL did_buy_production; remove-cap(bought-shields)
+  BOOL did_sell, was_happy;
 
   BOOL diplomat_investigate;
   UINT8 walls;
diff --git a/server/cityhand.cpp b/server/cityhand.cpp
index 9f4cf6d39d..8a0949427b 100644
--- a/server/cityhand.cpp
+++ b/server/cityhand.cpp
@@ -336,10 +336,9 @@ void really_handle_city_buy(struct player *pplayer, struct city *pcity)
   if (pcity->shield_stock < total) {
     /* As we never put penalty on disbanded_shields, we can
      * fully well add the missing shields there. */
-    pcity->disbanded_shields += total - pcity->shield_stock;
+    pcity->bought_shields += total - pcity->shield_stock;
     pcity->shield_stock = total; // AI wants this -- Syela
     pcity->did_buy = true;       // !PS: no need to set buy flag otherwise
-    pcity->did_buy_production = true;
   }
   city_refresh(pcity);
 
diff --git a/server/citytools.cpp b/server/citytools.cpp
index afce8bcbf7..26706d1e50 100644
--- a/server/citytools.cpp
+++ b/server/citytools.cpp
@@ -2571,13 +2571,14 @@ void package_city(struct city *pcity, struct packet_city_info *packet,
   packet->disbanded_shields = pcity->disbanded_shields;
   packet->caravan_shields = pcity->caravan_shields;
   packet->last_turns_shield_surplus = pcity->last_turns_shield_surplus;
+  packet->bought_shields = pcity->bought_shields;
 
   worklist_copy(&packet->worklist, &pcity->worklist);
   packet->diplomat_investigate = dipl_invest;
 
   packet->airlift = pcity->airlift;
   packet->did_buy = pcity->did_buy;
-  packet->did_buy_production = pcity->did_buy_production;
+  packet->did_buy_production = pcity->bought_shields > 0;
   packet->did_sell = pcity->did_sell;
   packet->was_happy = pcity->was_happy;
 
diff --git a/server/cityturn.cpp b/server/cityturn.cpp
index d7860f1d20..5bd17ca5eb 100644
--- a/server/cityturn.cpp
+++ b/server/cityturn.cpp
@@ -2373,10 +2373,10 @@ static bool city_build_building(struct player *pplayer, struct city *pcity)
       wonder_set_build_turn(pplayer, pimprove);
     }
     cost = impr_build_shield_cost(pcity, pimprove);
+    pcity->bought_shields = 0;
     pcity->before_change_shields -= cost;
     pcity->shield_stock -= cost;
     pcity->turn_last_built = game.info.turn;
-    pcity->did_buy_production = false;
     // to eliminate micromanagement
     if (is_great_wonder(pimprove)) {
       notify_player(nullptr, city_tile(pcity), E_WONDER_BUILD, ftc_server,
@@ -2575,7 +2575,6 @@ static bool city_build_unit(struct player *pplayer, struct city *pcity)
 
     // don't update turn_last_built if we returned above
     pcity->turn_last_built = game.info.turn;
-    pcity->did_buy_production = false;
     // check if we can build more than one unit (effect City_Build_Slots)
     (void) city_production_build_units(pcity, false, &num_units);
 
@@ -2614,6 +2613,7 @@ static bool city_build_unit(struct player *pplayer, struct city *pcity)
       // to eliminate micromanagement, we only subtract the unit's cost
       pcity->before_change_shields -= unit_shield_cost;
       pcity->shield_stock -= unit_shield_cost;
+      pcity->bought_shields = 0;
 
       if (pop_cost > 0) {
         // Additional message if the unit has population cost.
diff --git a/server/savegame/savegame3.cpp b/server/savegame/savegame3.cpp
index 100410d336..cd60938083 100644
--- a/server/savegame/savegame3.cpp
+++ b/server/savegame/savegame3.cpp
@@ -4809,8 +4809,8 @@ static bool sg_load_player_city(struct loaddata *loading, struct player *plr,
                                       "%s.did_buy", citystr),
                   false, "%s", secfile_error());
   // May not be present in older saves
-  pcity->did_buy_production = secfile_lookup_bool_default(
-      loading->file, false, "%s.did_buy_production", citystr);
+  pcity->bought_shields = secfile_lookup_int_default(
+      loading->file, 0, "%s.bought_shields", citystr);
   sg_warn_ret_val(secfile_lookup_bool(loading->file, &pcity->did_sell,
                                       "%s.did_sell", citystr),
                   false, "%s", secfile_error());
@@ -5263,8 +5263,6 @@ static void sg_save_player_cities(struct savedata *saving,
     secfile_insert_int(saving->file, pcity->turn_founded, "%s.turn_founded",
                        buf);
     secfile_insert_bool(saving->file, pcity->did_buy, "%s.did_buy", buf);
-    secfile_insert_bool(saving->file, pcity->did_buy_production,
-                        "%s.did_buy_production", buf);
     secfile_insert_bool(saving->file, pcity->did_sell, "%s.did_sell", buf);
     secfile_insert_int(saving->file, pcity->turn_last_built,
                        "%s.turn_last_built", buf);
@@ -5287,6 +5285,8 @@ static void sg_save_player_cities(struct savedata *saving,
 
     secfile_insert_int(saving->file, pcity->before_change_shields,
                        "%s.before_change_shields", buf);
+    secfile_insert_int(saving->file, pcity->bought_shields,
+                       "%s.bought_shields", buf);
     secfile_insert_int(saving->file, pcity->caravan_shields,
                        "%s.caravan_shields", buf);
     secfile_insert_int(saving->file, pcity->disbanded_shields,
diff --git a/utility/fc_version.h.in b/utility/fc_version.h.in
index 21af474ef8..04673e0ce7 100644
--- a/utility/fc_version.h.in
+++ b/utility/fc_version.h.in
@@ -17,7 +17,8 @@
 #endif
 
 #define NETWORK_CAPSTRING                                                   \
-  "+Freeciv21.21April13 killunhomed-is-game-info player-intel-visibility"
+  "+Freeciv21.21April13 killunhomed-is-game-info player-intel-visibility " \
+  "bought-shields"
 
 #ifndef FOLLOWTAG
 #define FOLLOWTAG "S_HAXXOR"