diff --git a/src/ORBextractor.cc b/src/ORBextractor.cc
index 2c3f9c3022..a76b81a857 100644
--- a/src/ORBextractor.cc
+++ b/src/ORBextractor.cc
@@ -54,6 +54,7 @@
 */
 
 #include <vector>
+#include <opencv2/opencv.hpp>
 #include <opencv2/core/core.hpp>
 #include <opencv2/highgui/highgui.hpp>
 #include <opencv2/imgproc/imgproc.hpp>