diff --git a/libcockatrice_network/libcockatrice/network/server/remote/game/server_counter.cpp b/libcockatrice_network/libcockatrice/network/server/remote/game/server_counter.cpp
index b18e11c2b..e65205cbb 100644
--- a/libcockatrice_network/libcockatrice/network/server/remote/game/server_counter.cpp
+++ b/libcockatrice_network/libcockatrice/network/server/remote/game/server_counter.cpp
@@ -1,12 +1,24 @@
 #include "server_counter.h"
 
 #include <libcockatrice/protocol/pb/serverinfo_counter.pb.h>
+#include <limits>
 
 Server_Counter::Server_Counter(int _id, const QString &_name, const color &_counterColor, int _radius, int _count)
     : id(_id), name(_name), counterColor(_counterColor), radius(_radius), count(_count)
 {
 }
 
+//! \todo Extract overflow-safe arithmetic into shared helper.
+//! Duplicated in Server_Card::incrementCounter() - keep in sync if modified.
+bool Server_Counter::incrementCount(int delta)
+{
+    const int oldCount = count;
+    const auto result = static_cast<int64_t>(count) + static_cast<int64_t>(delta);
+    count = static_cast<int>(qBound(static_cast<int64_t>(std::numeric_limits<int>::min()), result,
+                                    static_cast<int64_t>(std::numeric_limits<int>::max())));
+    return count != oldCount;
+}
+
 void Server_Counter::getInfo(ServerInfo_Counter *info)
 {
     info->set_id(id);
diff --git a/libcockatrice_network/libcockatrice/network/server/remote/game/server_counter.h b/libcockatrice_network/libcockatrice/network/server/remote/game/server_counter.h
index 3bd8d380c..8226e663f 100644
--- a/libcockatrice_network/libcockatrice/network/server/remote/game/server_counter.h
+++ b/libcockatrice_network/libcockatrice/network/server/remote/game/server_counter.h
@@ -22,7 +22,6 @@
 
 #include <QString>
 #include <libcockatrice/protocol/pb/color.pb.h>
-#include <limits>
 
 class ServerInfo_Counter;
 
@@ -93,16 +92,7 @@ public:
      * @return true if the value changed, false otherwise.
      * @note Clamps result to [INT_MIN, INT_MAX] to prevent overflow.
      */
-    [[nodiscard]] bool incrementCount(int delta)
-    {
-        // TODO: Extract overflow-safe arithmetic into shared helper.
-        // Duplicated in Server_Card::incrementCounter() - keep in sync if modified.
-        const int oldCount = count;
-        const auto result = static_cast<int64_t>(count) + static_cast<int64_t>(delta);
-        count = static_cast<int>(qBound(static_cast<int64_t>(std::numeric_limits<int>::min()), result,
-                                        static_cast<int64_t>(std::numeric_limits<int>::max())));
-        return count != oldCount;
-    }
+    [[nodiscard]] bool incrementCount(int delta);
 
     /**
      * @brief Populates info with this counter's current state for network serialization.