diff --git a/src/net.cpp b/src/net.cpp
index 0a1670997d..d30c9f5fd8 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -3111,8 +3111,8 @@ public:
         WSACleanup();
 #endif
     }
-}
-instance_of_cnetcleanup;
+};
+static CNetCleanup instance_of_cnetcleanup;
 
 void CExplicitNetCleanup::callCleanup()
 {
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 07b1253d8c..7f02d39b96 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -4863,4 +4863,5 @@ public:
         mapOrphanTransactionsByPrev.clear();
         nMapOrphanTransactionsSize = 0;
     }
-} instance_of_cnetprocessingcleanup;
+};
+static CNetProcessingCleanup instance_of_cnetprocessingcleanup;
diff --git a/src/ui_interface.cpp b/src/ui_interface.cpp
index 2352581cf0..fc2826fffa 100644
--- a/src/ui_interface.cpp
+++ b/src/ui_interface.cpp
@@ -25,7 +25,8 @@ struct UISignals {
     boost::signals2::signal<CClientUIInterface::NotifyMasternodeListChangedSig> NotifyMasternodeListChanged;
     boost::signals2::signal<CClientUIInterface::NotifyAdditionalDataSyncProgressChangedSig> NotifyAdditionalDataSyncProgressChanged;
     boost::signals2::signal<CClientUIInterface::BannedListChangedSig> BannedListChanged;
-} g_ui_signals;
+};
+static UISignals g_ui_signals;
 
 #define ADD_SIGNALS_IMPL_WRAPPER(signal_name)                                                                 \
     boost::signals2::connection CClientUIInterface::signal_name##_connect(std::function<signal_name##Sig> fn) \
diff --git a/src/validation.cpp b/src/validation.cpp
index 65816665f5..e7de571b3b 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -101,7 +101,7 @@ bool CBlockIndexWorkComparator::operator()(const CBlockIndex* pa, const CBlockIn
     return false;
 }
 
-CChainState g_chainstate;
+static CChainState g_chainstate;
 
 CChainState& ChainstateActive() { return g_chainstate; }
 CChain& ChainActive() { return g_chainstate.m_chain; }
@@ -1133,7 +1133,7 @@ bool CChainState::IsInitialBlockDownload() const
     return false;
 }
 
-CBlockIndex *pindexBestForkTip = nullptr, *pindexBestForkBase = nullptr;
+static CBlockIndex *pindexBestForkTip = nullptr, *pindexBestForkBase = nullptr;
 
 static void AlertNotify(const std::string& strMessage)
 {
@@ -5183,4 +5183,5 @@ public:
             delete (*it1).second;
         mapBlockIndex.clear();
     }
-} instance_of_cmaincleanup;
+};
+static CMainCleanup instance_of_cmaincleanup;