diff --git a/libi2pd/NetDbRequests.cpp b/libi2pd/NetDbRequests.cpp
index b04cb5d0..3e4d4eb3 100644
--- a/libi2pd/NetDbRequests.cpp
+++ b/libi2pd/NetDbRequests.cpp
@@ -31,6 +31,7 @@ namespace data
 	std::shared_ptr<I2NPMessage> RequestedDestination::CreateRequestMessage (std::shared_ptr<const RouterInfo> router,
 		std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel)
 	{
+		std::lock_guard<std::mutex> l (m_ExcludedPeerstMutex);
 		std::shared_ptr<I2NPMessage> msg;
 		if(replyTunnel)
 			msg = i2p::CreateRouterInfoDatabaseLookupMsg (m_Destination,
@@ -53,8 +54,15 @@ namespace data
 		return msg;
 	}
 
+	bool RequestedDestination::IsExcluded (const IdentHash& ident) const 
+	{ 
+		std::lock_guard<std::mutex> l (m_ExcludedPeerstMutex);
+		return m_ExcludedPeers.count (ident); 
+	}
+		
 	void RequestedDestination::ClearExcludedPeers ()
 	{
+		std::lock_guard<std::mutex> l (m_ExcludedPeerstMutex);
 		m_ExcludedPeers.clear ();
 	}
 
diff --git a/libi2pd/NetDbRequests.h b/libi2pd/NetDbRequests.h
index a9997ad7..1d50ee79 100644
--- a/libi2pd/NetDbRequests.h
+++ b/libi2pd/NetDbRequests.h
@@ -36,12 +36,12 @@ namespace data
 
 			const IdentHash& GetDestination () const { return m_Destination; };
 			int GetNumExcludedPeers () const { return m_ExcludedPeers.size (); };
-			const std::set<IdentHash>& GetExcludedPeers () { return m_ExcludedPeers; };
+			const std::set<IdentHash>& GetExcludedPeers () const { return m_ExcludedPeers; };
 			void ClearExcludedPeers ();
 			bool IsExploratory () const { return m_IsExploratory; };
 			bool IsDirect () const { return m_IsDirect; };
 			bool IsActive () const { return m_IsActive; };
-			bool IsExcluded (const IdentHash& ident) const { return m_ExcludedPeers.count (ident); };
+			bool IsExcluded (const IdentHash& ident) const;
 			uint64_t GetCreationTime () const { return m_CreationTime; };
 			uint64_t GetLastRequestTime () const { return m_LastRequestTime; };
 			std::shared_ptr<I2NPMessage> CreateRequestMessage (std::shared_ptr<const RouterInfo>, std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel);
@@ -57,6 +57,7 @@ namespace data
 
 			IdentHash m_Destination;
 			bool m_IsExploratory, m_IsDirect, m_IsActive;
+			mutable std::mutex m_ExcludedPeerstMutex;
 			std::set<IdentHash> m_ExcludedPeers;
 			uint64_t m_CreationTime, m_LastRequestTime; // in seconds
 			RequestComplete m_RequestComplete;