diff --git a/src/net.cpp b/src/net.cpp
index 3c6f5a05f..75a47d7ad 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -2287,8 +2287,8 @@ public:
         WSACleanup();
 #endif
     }
-}
-instance_of_cnetcleanup;
+};
+static CNetCleanup instance_of_cnetcleanup;
 
 void CConnman::Interrupt()
 {
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index e57706980..5ff456fcb 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -4086,4 +4086,5 @@ public:
         mapOrphanTransactions.clear();
         mapOrphanTransactionsByPrev.clear();
     }
-} instance_of_cnetprocessingcleanup;
+};
+static CNetProcessingCleanup instance_of_cnetprocessingcleanup;
diff --git a/src/ui_interface.cpp b/src/ui_interface.cpp
index 746514a01..d31063714 100644
--- a/src/ui_interface.cpp
+++ b/src/ui_interface.cpp
@@ -21,7 +21,8 @@ struct UISignals {
     boost::signals2::signal<CClientUIInterface::NotifyBlockTipSig> NotifyBlockTip;
     boost::signals2::signal<CClientUIInterface::NotifyHeaderTipSig> NotifyHeaderTip;
     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 3026df34f..2d2252c25 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -77,7 +77,7 @@ bool CBlockIndexWorkComparator::operator()(const CBlockIndex *pa, const CBlockIn
     return false;
 }
 
-CChainState g_chainstate;
+static CChainState g_chainstate;
 
 CChainState& ChainstateActive() { return g_chainstate; }
 
@@ -1044,7 +1044,7 @@ bool CChainState::IsInitialBlockDownload() const
     return false;
 }
 
-CBlockIndex *pindexBestForkTip = nullptr, *pindexBestForkBase = nullptr;
+static CBlockIndex *pindexBestForkTip = nullptr, *pindexBestForkBase = nullptr;
 
 static void AlertNotify(const std::string& strMessage)
 {
@@ -4757,4 +4757,5 @@ public:
             delete (*it1).second;
         mapBlockIndex.clear();
     }
-} instance_of_cmaincleanup;
+};
+static CMainCleanup instance_of_cmaincleanup;