diff --git a/RobustTextDetection/RobustTextDetection.h b/RobustTextDetection/RobustTextDetection.h
index 2942786..eb608e0 100644
--- a/RobustTextDetection/RobustTextDetection.h
+++ b/RobustTextDetection/RobustTextDetection.h
@@ -9,6 +9,7 @@
 #ifndef __RobustTextDetection__RobustTextDetection__
 #define __RobustTextDetection__RobustTextDetection__
 
+#include <bitset>
 #include <iostream>
 #include <opencv2/opencv.hpp>