diff --git a/Source/Core/Common/TraversalClient.cpp b/Source/Core/Common/TraversalClient.cpp
index a2cd9b2647..cc1e4a148d 100644
--- a/Source/Core/Common/TraversalClient.cpp
+++ b/Source/Core/Common/TraversalClient.cpp
@@ -16,8 +16,8 @@ static void GetRandomishBytes(u8* buf, size_t size)
 }
 
 TraversalClient::TraversalClient(ENetHost* netHost, const std::string& server, const u16 port)
-    : m_NetHost(netHost), m_Client(nullptr), m_FailureReason(0), m_ConnectRequestId(0),
-      m_PendingConnect(false), m_Server(server), m_port(port), m_PingTime(0)
+    : m_NetHost(netHost), m_Client(nullptr), m_ConnectRequestId(0), m_PendingConnect(false),
+      m_Server(server), m_port(port), m_PingTime(0)
 {
   netHost->intercept = TraversalClient::InterceptCallback;
 
@@ -34,7 +34,7 @@ void TraversalClient::ReconnectToServer()
 {
   if (enet_address_set_host(&m_ServerAddress, m_Server.c_str()))
   {
-    OnFailure(BadHost);
+    OnFailure(FailureReason::BadHost);
     return;
   }
   m_ServerAddress.port = m_port;
@@ -123,7 +123,7 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
   case TraversalPacketAck:
     if (!packet->ack.ok)
     {
-      OnFailure(ServerForgotAboutUs);
+      OnFailure(FailureReason::ServerForgotAboutUs);
       break;
     }
     for (auto it = m_OutgoingTraversalPackets.begin(); it != m_OutgoingTraversalPackets.end(); ++it)
@@ -140,7 +140,7 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
       break;
     if (!packet->helloFromServer.ok)
     {
-      OnFailure(VersionTooOld);
+      OnFailure(FailureReason::VersionTooOld);
       break;
     }
     m_HostId = packet->helloFromServer.yourHostId;
@@ -199,7 +199,7 @@ void TraversalClient::HandleServerPacket(TraversalPacket* packet)
     buf.data = &ack;
     buf.dataLength = sizeof(ack);
     if (enet_socket_send(m_NetHost->socket, &m_ServerAddress, &buf, 1) == -1)
-      OnFailure(SocketSendError);
+      OnFailure(FailureReason::SocketSendError);
   }
 }
 
@@ -220,7 +220,7 @@ void TraversalClient::ResendPacket(OutgoingTraversalPacketInfo* info)
   buf.data = &info->packet;
   buf.dataLength = sizeof(info->packet);
   if (enet_socket_send(m_NetHost->socket, &m_ServerAddress, &buf, 1) == -1)
-    OnFailure(SocketSendError);
+    OnFailure(FailureReason::SocketSendError);
 }
 
 void TraversalClient::HandleResends()
@@ -232,7 +232,7 @@ void TraversalClient::HandleResends()
     {
       if (tpi.tries >= 5)
       {
-        OnFailure(ResendTimeout);
+        OnFailure(FailureReason::ResendTimeout);
         m_OutgoingTraversalPackets.clear();
         break;
       }
diff --git a/Source/Core/Common/TraversalClient.h b/Source/Core/Common/TraversalClient.h
index 82a7d71c8e..befd530174 100644
--- a/Source/Core/Common/TraversalClient.h
+++ b/Source/Core/Common/TraversalClient.h
@@ -28,7 +28,7 @@ public:
     Connected,
     Failure
   };
-  enum FailureReason
+  enum class FailureReason
   {
     BadHost = 0x300,
     VersionTooOld,
@@ -50,7 +50,7 @@ public:
   TraversalClientClient* m_Client;
   TraversalHostId m_HostId;
   State m_State;
-  int m_FailureReason;
+  FailureReason m_FailureReason;
 
 private:
   struct OutgoingTraversalPacketInfo
diff --git a/Source/Core/Core/NetPlayClient.h b/Source/Core/Core/NetPlayClient.h
index 79545a6d35..00decb8093 100644
--- a/Source/Core/Core/NetPlayClient.h
+++ b/Source/Core/Core/NetPlayClient.h
@@ -34,7 +34,7 @@ public:
   virtual void OnPadBufferChanged(u32 buffer) = 0;
   virtual void OnDesync(u32 frame, const std::string& player) = 0;
   virtual void OnConnectionLost() = 0;
-  virtual void OnTraversalError(int error) = 0;
+  virtual void OnTraversalError(TraversalClient::FailureReason error) = 0;
   virtual bool IsRecording() = 0;
   virtual std::string FindGame(const std::string& game) = 0;
   virtual void ShowMD5Dialog(const std::string& file_identifier) = 0;
diff --git a/Source/Core/DolphinWX/NetPlay/NetWindow.cpp b/Source/Core/DolphinWX/NetPlay/NetWindow.cpp
index 870851dee1..dad161cba7 100644
--- a/Source/Core/DolphinWX/NetPlay/NetWindow.cpp
+++ b/Source/Core/DolphinWX/NetPlay/NetWindow.cpp
@@ -457,19 +457,19 @@ void NetPlayDialog::OnConnectionLost()
   GetEventHandler()->AddPendingEvent(evt);
 }
 
-void NetPlayDialog::OnTraversalError(int error)
+void NetPlayDialog::OnTraversalError(TraversalClient::FailureReason error)
 {
   switch (error)
   {
-  case TraversalClient::BadHost:
+  case TraversalClient::FailureReason::BadHost:
     PanicAlertT("Couldn't look up central server");
     break;
-  case TraversalClient::VersionTooOld:
+  case TraversalClient::FailureReason::VersionTooOld:
     PanicAlertT("Dolphin is too old for traversal server");
     break;
-  case TraversalClient::ServerForgotAboutUs:
-  case TraversalClient::SocketSendError:
-  case TraversalClient::ResendTimeout:
+  case TraversalClient::FailureReason::ServerForgotAboutUs:
+  case TraversalClient::FailureReason::SocketSendError:
+  case TraversalClient::FailureReason::ResendTimeout:
     wxThreadEvent evt(wxEVT_THREAD, NP_GUI_EVT_TRAVERSAL_CONNECTION_ERROR);
     GetEventHandler()->AddPendingEvent(evt);
     break;
diff --git a/Source/Core/DolphinWX/NetPlay/NetWindow.h b/Source/Core/DolphinWX/NetPlay/NetWindow.h
index ce77a6dfd7..e3ccbf952f 100644
--- a/Source/Core/DolphinWX/NetPlay/NetWindow.h
+++ b/Source/Core/DolphinWX/NetPlay/NetWindow.h
@@ -102,7 +102,7 @@ public:
   void OnPadBufferChanged(u32 buffer) override;
   void OnDesync(u32 frame, const std::string& player) override;
   void OnConnectionLost() override;
-  void OnTraversalError(int error) override;
+  void OnTraversalError(TraversalClient::FailureReason error) override;
 
   static NetPlayDialog*& GetInstance() { return npd; }
   static NetPlayClient*& GetNetPlayClient() { return netplay_client; }