diff --git a/svo/include/svo/frame_handler_mono.h b/svo/include/svo/frame_handler_mono.h
index cfeb4334..aed73be4 100644
--- a/svo/include/svo/frame_handler_mono.h
+++ b/svo/include/svo/frame_handler_mono.h
@@ -17,6 +17,7 @@
 #ifndef SVO_FRAME_HANDLER_H_
 #define SVO_FRAME_HANDLER_H_
 
+#include <set>
 #include <vikit/abstract_camera.h>
 #include <svo/frame_handler_base.h>
 #include <svo/reprojector.h>