diff --git a/outofcore/include/pcl/outofcore/visualization/geometry.h b/outofcore/include/pcl/outofcore/visualization/geometry.h
index 66e67e353c7..3e4bf506b2c 100644
--- a/outofcore/include/pcl/outofcore/visualization/geometry.h
+++ b/outofcore/include/pcl/outofcore/visualization/geometry.h
@@ -2,6 +2,7 @@
 
 // C++
 #include <string>
+#include <iostream>
 
 // PCL
 #include "object.h"