diff --git a/src/net.cpp b/src/net.cpp
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -2549,7 +2549,8 @@
         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
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -5010,4 +5010,5 @@
         mapOrphanTransactions.clear();
         mapOrphanTransactionsByPrev.clear();
     }
-} instance_of_cnetprocessingcleanup;
+};
+static CNetProcessingCleanup instance_of_cnetprocessingcleanup;
diff --git a/src/ui_interface.cpp b/src/ui_interface.cpp
--- a/src/ui_interface.cpp
+++ b/src/ui_interface.cpp
@@ -31,7 +31,8 @@
         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(     \
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -64,7 +64,7 @@
 #define MICRO 0.000001
 #define MILLI 0.001
 
-CChainState g_chainstate;
+static CChainState g_chainstate;
 
 CChainState &ChainstateActive() {
     return g_chainstate;
@@ -834,8 +834,8 @@
     return false;
 }
 
-CBlockIndex const *pindexBestForkTip = nullptr;
-CBlockIndex const *pindexBestForkBase = nullptr;
+static CBlockIndex const *pindexBestForkTip = nullptr;
+static CBlockIndex const *pindexBestForkBase = nullptr;
 
 static void AlertNotify(const std::string &strMessage) {
     uiInterface.NotifyAlertChanged();
@@ -5633,4 +5633,5 @@
         }
         mapBlockIndex.clear();
     }
-} instance_of_cmaincleanup;
+};
+static CMainCleanup instance_of_cmaincleanup;