diff --git a/src/citra_qt/CMakeLists.txt b/src/citra_qt/CMakeLists.txt
index 502531fca..edd2a3eb2 100644
--- a/src/citra_qt/CMakeLists.txt
+++ b/src/citra_qt/CMakeLists.txt
@@ -228,6 +228,15 @@ target_compile_definitions(citra-qt PRIVATE
     # Use QStringBuilder for string concatenation to reduce
     # the overall number of temporary strings created.
     -DQT_USE_QSTRINGBUILDER
+
+    # Disable implicit type narrowing in signal/slot connect() calls.
+    -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT
+
+    # Disable unsafe overloads of QProcess' start() function.
+    -DQT_NO_PROCESS_COMBINED_ARGUMENT_START
+
+    # Disable implicit QString->QUrl conversions to enforce use of proper resolving functions.
+    -DQT_NO_URL_CAST_FROM_STRING
 )
 
 if (CITRA_ENABLE_COMPATIBILITY_REPORTING)
diff --git a/src/citra_qt/configuration/configure_graphics.cpp b/src/citra_qt/configuration/configure_graphics.cpp
index 2b895ecc0..f509377e6 100644
--- a/src/citra_qt/configuration/configure_graphics.cpp
+++ b/src/citra_qt/configuration/configure_graphics.cpp
@@ -21,11 +21,10 @@ ConfigureGraphics::ConfigureGraphics(QWidget* parent)
     ui->layoutBox->setEnabled(!Settings::values.custom_layout);
 
     ui->hw_renderer_group->setEnabled(ui->toggle_hw_renderer->isChecked());
-    connect(ui->toggle_hw_renderer, &QCheckBox::stateChanged, ui->hw_renderer_group,
+    connect(ui->toggle_hw_renderer, &QCheckBox::toggled, ui->hw_renderer_group,
             &QWidget::setEnabled);
     ui->hw_shader_group->setEnabled(ui->toggle_hw_shader->isChecked());
-    connect(ui->toggle_hw_shader, &QCheckBox::stateChanged, ui->hw_shader_group,
-            &QWidget::setEnabled);
+    connect(ui->toggle_hw_shader, &QCheckBox::toggled, ui->hw_shader_group, &QWidget::setEnabled);
 #ifdef __APPLE__
     connect(ui->toggle_hw_shader, &QCheckBox::stateChanged, this, [this](int state) {
         if (state == Qt::Checked) {
diff --git a/src/citra_qt/multiplayer/chat_room.cpp b/src/citra_qt/multiplayer/chat_room.cpp
index e16b86217..1699ed8ef 100644
--- a/src/citra_qt/multiplayer/chat_room.cpp
+++ b/src/citra_qt/multiplayer/chat_room.cpp
@@ -425,7 +425,7 @@ void ChatRoom::PopupContextMenu(const QPoint& menu_location) {
         QAction* view_profile_action = context_menu.addAction(tr("View Profile"));
         connect(view_profile_action, &QAction::triggered, [username] {
             QDesktopServices::openUrl(
-                QString("https://community.citra-emu.org/u/%1").arg(username));
+                QUrl(QString("https://community.citra-emu.org/u/%1").arg(username)));
         });
     }
 
diff --git a/src/citra_qt/multiplayer/lobby.cpp b/src/citra_qt/multiplayer/lobby.cpp
index c06738565..cd38c5a22 100644
--- a/src/citra_qt/multiplayer/lobby.cpp
+++ b/src/citra_qt/multiplayer/lobby.cpp
@@ -64,9 +64,8 @@ Lobby::Lobby(QWidget* parent, QStandardItemModel* list,
 
     // UI Buttons
     connect(ui->refresh_list, &QPushButton::pressed, this, &Lobby::RefreshLobby);
-    connect(ui->games_owned, &QCheckBox::stateChanged, proxy,
-            &LobbyFilterProxyModel::SetFilterOwned);
-    connect(ui->hide_full, &QCheckBox::stateChanged, proxy, &LobbyFilterProxyModel::SetFilterFull);
+    connect(ui->games_owned, &QCheckBox::toggled, proxy, &LobbyFilterProxyModel::SetFilterOwned);
+    connect(ui->hide_full, &QCheckBox::toggled, proxy, &LobbyFilterProxyModel::SetFilterFull);
     connect(ui->search, &QLineEdit::textChanged, proxy, &LobbyFilterProxyModel::SetFilterSearch);
     connect(ui->room_list, &QTreeView::doubleClicked, this, &Lobby::OnJoinRoom);
     connect(ui->room_list, &QTreeView::clicked, this, &Lobby::OnExpandRoom);