diff --git a/apps/opencs/view/render/object.cpp b/apps/opencs/view/render/object.cpp
index 6ddea913ad..ea27b14320 100644
--- a/apps/opencs/view/render/object.cpp
+++ b/apps/opencs/view/render/object.cpp
@@ -1,6 +1,7 @@
 #include "object.hpp"
 
 #include <stdexcept>
+#include <iostream>
 
 #include <osg/Group>
 #include <osg/PositionAttitudeTransform>