diff --git a/src/inet/visualizer/osg/common/PacketDropOsgVisualizer.h b/src/inet/visualizer/osg/common/PacketDropOsgVisualizer.h
index 1026ba97ebc..d6f99b8203b 100644
--- a/src/inet/visualizer/osg/common/PacketDropOsgVisualizer.h
+++ b/src/inet/visualizer/osg/common/PacketDropOsgVisualizer.h
@@ -8,6 +8,7 @@
 #ifndef __INET_PACKETDROPOSGVISUALIZER_H
 #define __INET_PACKETDROPOSGVISUALIZER_H
 
+#include <osg/Node>
 #include <osg/ref_ptr>
 
 #include "inet/visualizer/base/PacketDropVisualizerBase.h"
diff --git a/src/inet/visualizer/osg/linklayer/LinkBreakOsgVisualizer.h b/src/inet/visualizer/osg/linklayer/LinkBreakOsgVisualizer.h
index 4c08d14e018..1b14e48b264 100644
--- a/src/inet/visualizer/osg/linklayer/LinkBreakOsgVisualizer.h
+++ b/src/inet/visualizer/osg/linklayer/LinkBreakOsgVisualizer.h
@@ -8,6 +8,7 @@
 #ifndef __INET_LINKBREAKOSGVISUALIZER_H
 #define __INET_LINKBREAKOSGVISUALIZER_H
 
+#include <osg/Node>
 #include <osg/ref_ptr>
 
 #include "inet/visualizer/base/LinkBreakVisualizerBase.h"
diff --git a/src/inet/visualizer/osg/networklayer/RoutingTableOsgVisualizer.h b/src/inet/visualizer/osg/networklayer/RoutingTableOsgVisualizer.h
index ed0192d310a..5b1b0bb49be 100644
--- a/src/inet/visualizer/osg/networklayer/RoutingTableOsgVisualizer.h
+++ b/src/inet/visualizer/osg/networklayer/RoutingTableOsgVisualizer.h
@@ -8,6 +8,7 @@
 #ifndef __INET_ROUTINGTABLEOSGVISUALIZER_H
 #define __INET_ROUTINGTABLEOSGVISUALIZER_H
 
+#include <osg/Node>
 #include <osg/ref_ptr>
 
 #include "inet/visualizer/base/RoutingTableVisualizerBase.h"