diff --git a/AdaptiveBrightness/main_window.cpp b/AdaptiveBrightness/main_window.cpp
index 2d7bb18..c1b9b32 100644
--- a/AdaptiveBrightness/main_window.cpp
+++ b/AdaptiveBrightness/main_window.cpp
@@ -347,8 +347,8 @@ bool MainWindow::setMonitorBrightness(float brightness)
         if(!m_monitors[i].driver.setBrightness(m_monitors[i].brightness)) {
             errorOccurred = true;
         }
-        else if(m_ui.monitorDropdown->currentIndex() == i) {
-            updateCurrentMonitorGUI(i);
+        else if(m_ui.monitorDropdown->currentIndex() == static_cast<int>(i)) {
+            updateCurrentMonitorGUI(static_cast<int>(i));
         }
     }