diff --git a/src/init.cpp b/src/init.cpp
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -66,6 +66,7 @@
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/algorithm/string/split.hpp>
+#include <boost/signals2/signal.hpp>
 #include <boost/thread.hpp>
 
 #if ENABLE_ZMQ
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -39,6 +39,8 @@
 
 #include <univalue.h>
 
+#include <boost/signals2/signal.hpp>
+
 class HTTPRPCRequestProcessor;
 class CWallet;
 fs::path GetWalletDir();
diff --git a/src/txmempool.h b/src/txmempool.h
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -18,7 +18,6 @@
 #include <boost/multi_index/ordered_index.hpp>
 #include <boost/multi_index/sequenced_index.hpp>
 #include <boost/multi_index_container.hpp>
-#include <boost/signals2/signal.hpp>
 
 #include <atomic>
 #include <map>
@@ -778,10 +777,6 @@
 
     size_t DynamicMemoryUsage() const;
 
-    boost::signals2::signal<void(CTransactionRef)> NotifyEntryAdded;
-    boost::signals2::signal<void(CTransactionRef, MemPoolRemovalReason)>
-        NotifyEntryRemoved;
-
 private:
     /**
      * UpdateForDescendants is used by UpdateTransactionsFromBlock to update the
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -417,7 +417,6 @@
 
 void CTxMemPool::addUnchecked(const CTxMemPoolEntry &entry,
                               setEntries &setAncestors) {
-    NotifyEntryAdded(entry.GetSharedTx());
     // Add to memory pool without checking anything.
     // Used by AcceptToMemoryPool(), which DOES do all the appropriate checks.
     indexed_transaction_set::iterator newit = mapTx.insert(entry).first;
@@ -465,17 +464,14 @@
 }
 
 void CTxMemPool::removeUnchecked(txiter it, MemPoolRemovalReason reason) {
-    CTransactionRef ptx = it->GetSharedTx();
-    NotifyEntryRemoved(ptx, reason);
     if (reason != MemPoolRemovalReason::BLOCK) {
         // Notify clients that a transaction has been removed from the mempool
         // for any reason except being included in a block. Clients interested
         // in transactions included in blocks can subscribe to the
         // BlockConnected notification.
-        GetMainSignals().TransactionRemovedFromMempool(ptx);
+        GetMainSignals().TransactionRemovedFromMempool(it->GetSharedTx());
     }
 
-    NotifyEntryRemoved(it->GetSharedTx(), reason);
     for (const CTxIn &txin : it->GetTx().vin) {
         mapNextTx.erase(txin.prevout);
     }