diff --git a/cli.cpp b/cli.cpp
index bc3875f0..9ecd37f3 100644
--- a/cli.cpp
+++ b/cli.cpp
@@ -29,7 +29,7 @@
 \*-------------------------------------------------------------*/
 #ifdef _WIN32
 #include <shellapi.h>
-    #define strcasecmp strcmpi
+    #define strcasecmp _strcmpi
 #endif
 
 using namespace std::chrono_literals;
diff --git a/main.cpp b/main.cpp
index 9b06f0e9..a9cf6404 100644
--- a/main.cpp
+++ b/main.cpp
@@ -221,8 +221,10 @@ int main(int argc, char* argv[])
         /*-----------------------------------------------------*\
         | Enable high DPI scaling support                       |
         \*-----------------------------------------------------*/
-        QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps,    true);
-        QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
+        #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+            QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps,    true);
+            QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
+        #endif
 
         /*-----------------------------------------------------*\
         | Enable high DPI fractional scaling support on Windows |
diff --git a/qt/DeviceView.cpp b/qt/DeviceView.cpp
index 1131854a..eb187910 100644
--- a/qt/DeviceView.cpp
+++ b/qt/DeviceView.cpp
@@ -596,10 +596,17 @@ void DeviceView::mousePressEvent(QMouseEvent *event)
         /*-----------------------------------------------------*\
         | It's okay if the size becomes negative                |
         \*-----------------------------------------------------*/
-        selectionRect.setLeft(event->x());
-        selectionRect.setTop(event->y());
-        selectionRect.setRight(event->x());
-        selectionRect.setBottom(event->y());
+        #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+            selectionRect.setLeft(event->position().x());
+            selectionRect.setTop(event->position().y());
+            selectionRect.setRight(event->position().x());
+            selectionRect.setBottom(event->position().y());
+        #else
+            selectionRect.setLeft(event->x());
+            selectionRect.setTop(event->y());
+            selectionRect.setRight(event->x());
+            selectionRect.setBottom(event->y());
+        #endif
 
         updateSelection();
         update();
@@ -611,8 +618,14 @@ void DeviceView::mouseMoveEvent(QMouseEvent *event)
     if(per_led)
     {
         lastMousePos = event->pos();
-        selectionRect.setRight(event->x());
-        selectionRect.setBottom(event->y());
+
+        #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+            selectionRect.setRight(event->position().x());
+            selectionRect.setBottom(event->position().y());
+        #else
+            selectionRect.setRight(event->x());
+            selectionRect.setBottom(event->y());
+        #endif
 
         if(mouseDown)
         {
diff --git a/qt/OpenRGBDialog/OpenRGBDialog.cpp b/qt/OpenRGBDialog/OpenRGBDialog.cpp
index 72553497..2ee9392b 100644
--- a/qt/OpenRGBDialog/OpenRGBDialog.cpp
+++ b/qt/OpenRGBDialog/OpenRGBDialog.cpp
@@ -1641,7 +1641,11 @@ void OpenRGBDialog::onShowDialogMessage()
 
     DontShowAgain = false;
 
-    QObject::connect(CheckBox_DontShowAgain, &QCheckBox::stateChanged, [this](int state)
+    #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+        QObject::connect(CheckBox_DontShowAgain, &QCheckBox::checkStateChanged, [this](Qt::CheckState state)
+    #else
+        QObject::connect(CheckBox_DontShowAgain, &QCheckBox::stateChanged, [this](int state)
+    #endif
     {
         if(static_cast<Qt::CheckState>(state) == Qt::CheckState::Checked)
         {