diff --git a/AdaptiveBrightness/main_window.cpp b/AdaptiveBrightness/main_window.cpp
index d6f3fff..345e387 100644
--- a/AdaptiveBrightness/main_window.cpp
+++ b/AdaptiveBrightness/main_window.cpp
@@ -5,6 +5,7 @@
 
 #include <cmath>
 
+#include <QAbstractButton>
 #include <QCloseEvent>
 #include <QGroupBox>
 #include <QSlider>