diff --git a/modules/core/include/opencv2/core/utility.hpp b/modules/core/include/opencv2/core/utility.hpp
index bc33f03f5d..87c20f10c7 100644
--- a/modules/core/include/opencv2/core/utility.hpp
+++ b/modules/core/include/opencv2/core/utility.hpp
@@ -54,6 +54,7 @@
 #endif
 
 #include "opencv2/core.hpp"
+#include <ostream>
 
 namespace cv
 {