diff --git a/AdaptiveBrightness/main_window.cpp b/AdaptiveBrightness/main_window.cpp
index c1b9b32..fe31789 100644
--- a/AdaptiveBrightness/main_window.cpp
+++ b/AdaptiveBrightness/main_window.cpp
@@ -301,14 +301,14 @@ void MainWindow::updateState()
         sensorError = true;
     }
 
-    const auto iconBrightness = utils::map(brightness, 0.f, 1.f, size_t{0}, size_t{8});
-
     if(!setMonitorBrightness(brightness)) {
         enumMonitors();
         qInfo(ltr("At least one monitor became invalid, re-enumerating monitors found %1 valid monitor(s)").arg(m_monitors.size()));
         monitorError = true;
     }
 
+    const auto iconBrightness = utils::map(brightness, 0.f, 1.f, size_t{0}, size_t{8});
+
     if(!sensorError && !monitorError && m_trayIcon) {
         m_trayIcon->setIcon(*m_sensorStateIcons[iconBrightness]);
     }
@@ -324,7 +324,7 @@ void MainWindow::updateState()
     }
 }
 
-bool MainWindow::setMonitorBrightness(float brightness)
+bool MainWindow::setMonitorBrightness(float& brightness)
 {
     if(m_monitors.empty()) {
         return false;
@@ -352,8 +352,15 @@ bool MainWindow::setMonitorBrightness(float brightness)
         }
     }
 
+    if(!errorOccurred) {
+        auto avgBrightness = 0.f;
+        std::for_each(m_monitors.begin(), m_monitors.end(), [&avgBrightness](const auto& mon) { avgBrightness += mon.brightness; });
+        avgBrightness /= m_monitors.size();
+        brightness = avgBrightness;
+    }
+
     if(allMonitorsSameBrightness) {
-        m_ui.monitorOverallBrightnessSlider->setValue(utils::map(m_monitors.front().brightness, 0.f, 1.f, 0, 100));
+        m_ui.monitorOverallBrightnessSlider->setValue(utils::map(brightness, 0.f, 1.f, 0, 100));
     }
 
     return !errorOccurred;
diff --git a/AdaptiveBrightness/main_window.hpp b/AdaptiveBrightness/main_window.hpp
index 7e68f22..dd7608e 100644
--- a/AdaptiveBrightness/main_window.hpp
+++ b/AdaptiveBrightness/main_window.hpp
@@ -46,7 +46,7 @@ class MainWindow : public QMainWindow {
 
     void updateState();
 
-    bool setMonitorBrightness(float brightness);
+    bool setMonitorBrightness(float& brightness);
 
     void trayIconClicked(QSystemTrayIcon::ActivationReason reason);