diff --git a/include/opencv2/opencv.hpp b/include/opencv2/opencv.hpp
index efa40e468f..5d6b52da9d 100644
--- a/include/opencv2/opencv.hpp
+++ b/include/opencv2/opencv.hpp
@@ -46,6 +46,7 @@
 #include "opencv2/core/core_c.h"
 #include "opencv2/core/core.hpp"
 #include "opencv2/core/wimage.hpp"
+#include "opencv2/flann/flann.hpp"
 #include "opencv2/imgproc/imgproc_c.h"
 #include "opencv2/imgproc/imgproc.hpp"
 #include "opencv2/video/tracking.hpp"