diff --git a/src/qt/rpcconsole.cpp b/src/qt/rpcconsole.cpp
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -724,10 +724,14 @@
                 static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
         connect(banAction365d, &QAction::triggered, signalMapper,
                 static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
-        connect(
-            signalMapper,
-            static_cast<void (QSignalMapper::*)(int)>(&QSignalMapper::mapped),
-            this, &RPCConsole::banSelectedNode);
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+        const auto mappedIntEvent = &QSignalMapper::mappedInt;
+#else
+        const auto mappedIntEvent =
+            static_cast<void (QSignalMapper::*)(int)>(&QSignalMapper::mapped);
+#endif
+        connect(signalMapper, mappedIntEvent, this,
+                &RPCConsole::banSelectedNode);
 
         // peer table context menu signals
         connect(ui->peerWidget, &QTableView::customContextMenuRequested, this,
diff --git a/src/qt/transactionview.cpp b/src/qt/transactionview.cpp
--- a/src/qt/transactionview.cpp
+++ b/src/qt/transactionview.cpp
@@ -183,10 +183,15 @@
     mapperThirdPartyTxUrls = new QSignalMapper(this);
 
     // Connect actions
-    connect(mapperThirdPartyTxUrls,
-            static_cast<void (QSignalMapper::*)(const QString &)>(
-                &QSignalMapper::mapped),
-            this, &TransactionView::openThirdPartyTxUrl);
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 15, 0))
+    const auto mappedStringEvent = &QSignalMapper::mappedString;
+#else
+    const auto mappedStringEvent =
+        static_cast<void (QSignalMapper::*)(const QString &)>(
+            &QSignalMapper::mapped);
+#endif
+    connect(mapperThirdPartyTxUrls, mappedStringEvent, this,
+            &TransactionView::openThirdPartyTxUrl);
 
     connect(dateWidget,
             static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this,