diff --git a/src/server/game/Entities/Player/TradeData.cpp b/src/server/game/Entities/Player/TradeData.cpp
index 3d20e81fea2..a6b123c8c65 100644
--- a/src/server/game/Entities/Player/TradeData.cpp
+++ b/src/server/game/Entities/Player/TradeData.cpp
@@ -18,6 +18,7 @@
 #include "TradeData.h"
 #include "Item.h"
 #include "Player.h"
+#include "Random.h"
 #include "TradePackets.h"
 #include "WorldSession.h"
 
@@ -123,6 +124,11 @@ void TradeData::SetMoney(uint64 money)
     Update(true);
 }
 
+void TradeData::UpdateServerStateIndex()
+{
+    m_serverStateIndex = rand32();
+}
+
 void TradeData::Update(bool forTrader /*= true*/) const
 {
     if (forTrader)
diff --git a/src/server/game/Entities/Player/TradeData.h b/src/server/game/Entities/Player/TradeData.h
index be9682e4747..028144c7d41 100644
--- a/src/server/game/Entities/Player/TradeData.h
+++ b/src/server/game/Entities/Player/TradeData.h
@@ -65,7 +65,7 @@ public:
     void UpdateClientStateIndex() { ++m_clientStateIndex; }
 
     uint32 GetServerStateIndex() const { return m_serverStateIndex; }
-    void UpdateServerStateIndex() { m_serverStateIndex = rand32(); }
+    void UpdateServerStateIndex();
 
 private:
     void Update(bool for_trader = true) const;