diff --git a/src/platform/qt/GameController.h b/src/platform/qt/GameController.h
index 79b18d3bf..7b8d6908b 100644
--- a/src/platform/qt/GameController.h
+++ b/src/platform/qt/GameController.h
@@ -14,6 +14,7 @@
 #include <QTimer>
 
 #include <memory>
+#include <functional>
 
 #include <mgba/core/core.h>
 #include <mgba/core/thread.h>