diff --git a/src/86box.c b/src/86box.c
index 07dcbaf83..36638687a 100644
--- a/src/86box.c
+++ b/src/86box.c
@@ -1082,6 +1082,8 @@ usage:
 #ifdef _WIN32
     if (localtime_s(&time_buf, &now) == 0)
         info = &time_buf;
+    else
+        info = NULL;
 #else
     info = localtime_r(&now, &time_buf);
 #endif
diff --git a/src/cdrom/cdrom_image.c b/src/cdrom/cdrom_image.c
index 81fadb272..ac4d067b5 100644
--- a/src/cdrom/cdrom_image.c
+++ b/src/cdrom/cdrom_image.c
@@ -2073,10 +2073,8 @@ image_load_mds(cd_image_t *img, const char *mdsfile)
                 char     fn[2048] = { 0 };
                 fseek(fp, mds_footer.fn_offs, SEEK_SET);
                 if (mds_footer.fn_is_wide) {
-                    int len = 0;
                     for (int i = 0; i < 256; i++) {
                         fread(&(wfn[i]), 1, 2, fp);
-                        len++;
                         if (wfn[i] == 0x0000)
                             break;
                     }
diff --git a/src/qt/qt_mainwindow.cpp b/src/qt/qt_mainwindow.cpp
index 3b8bee2f0..7f611b9da 100644
--- a/src/qt/qt_mainwindow.cpp
+++ b/src/qt/qt_mainwindow.cpp
@@ -197,7 +197,7 @@ MainWindow::MainWindow(QWidget *parent)
     QTimer* frameRateTimer = new QTimer(this);
     frameRateTimer->setInterval(1000);
     frameRateTimer->setSingleShot(false);
-    connect(frameRateTimer, &QTimer::timeout, [this, hertz_label] {
+    connect(frameRateTimer, &QTimer::timeout, [hertz_label] {
         hertz_label->setText(tr("%1 Hz").arg(QString::number(monitors[0].mon_actualrenderedframes.load()) + (monitors[0].mon_interlace ? "i" : "")));
     });
     statusBar()->addPermanentWidget(hertz_label);
@@ -306,7 +306,7 @@ MainWindow::MainWindow(QWidget *parent)
 
     connect(this, &MainWindow::showMessageForNonQtThread, this, &MainWindow::showMessage_, Qt::QueuedConnection);
 
-    connect(this, &MainWindow::setTitle, this, [this, toolbar_label](const QString &title) {
+    connect(this, &MainWindow::setTitle, this, [toolbar_label](const QString &title) {
         if (dopause && !hide_tool_bar) {
             toolbar_label->setText(toolbar_label->text() + tr(" - PAUSED"));
             return;
diff --git a/src/qt/qt_vmmanager_main.cpp b/src/qt/qt_vmmanager_main.cpp
index f55c90389..c1f31824c 100644
--- a/src/qt/qt_vmmanager_main.cpp
+++ b/src/qt/qt_vmmanager_main.cpp
@@ -147,7 +147,7 @@ VMManagerMain::VMManagerMain(QWidget *parent) :
                 connect(buttonBox, &QDialogButtonBox::accepted, &dialog, &QDialog::accept);
                 connect(buttonBox, &QDialogButtonBox::rejected, &dialog, &QDialog::reject);
                 layout->addWidget(buttonBox);
-                connect(edit, &QLineEdit::textChanged, this, [this, errLabel, buttonBox] (const QString& text) {
+                connect(edit, &QLineEdit::textChanged, this, [errLabel, buttonBox] (const QString& text) {
                     bool isSpaceOnly = true;
 #ifdef Q_OS_WINDOWS
                     const char illegalChars[] = "<>:\"|?*\\/";
@@ -218,7 +218,7 @@ illegal_chars:
                     QString srcPath = selected_sysconfig->config_dir;
                     QString dstPath = vmDir;
 
-                    std::thread copyThread([this, &finished, srcPath, dstPath, &errCode] {
+                    std::thread copyThread([&finished, srcPath, dstPath, &errCode] {
                         errCode = copyPath(srcPath, dstPath, true);
                         finished = true;
                     });
@@ -285,7 +285,7 @@ illegal_chars:
 
             QAction deleteAction(tr("&Delete"));
             contextMenu.addAction(&deleteAction);
-            connect(&deleteAction, &QAction::triggered, [this, parent] {
+            connect(&deleteAction, &QAction::triggered, [this] {
                 deleteSystem(selected_sysconfig);
             });
             deleteAction.setEnabled(selected_sysconfig->process->state() == QProcess::NotRunning);
diff --git a/src/video/vid_ati_mach8.c b/src/video/vid_ati_mach8.c
index e0d66f5cc..24293ab1d 100644
--- a/src/video/vid_ati_mach8.c
+++ b/src/video/vid_ati_mach8.c
@@ -2475,7 +2475,7 @@ mach_out(uint16_t addr, uint8_t val, void *priv)
             if ((svga->crtcreg == 7) && ((svga->crtc[0x11] & 0x80) || (mach->regs[0xb4] & 0x40)) && !(mach->regs[0xb4] & 0x80))
                 val = (svga->crtc[7] & ~0x10) | (val & 0x10);
             if (mach->regs[0xb8] & 0x04) {
-                if ((svga->crtcreg < 0x0a) && (svga->crtcreg > 0x0d))
+                if ((svga->crtcreg < 0x0a) || (svga->crtcreg > 0x0d))
                     return;
             }
             if (mach->regs[0xb4] & 0x04) {