diff --git a/gui/viewers/graph_viewer/graph_viewer.cpp b/gui/viewers/graph_viewer/graph_viewer.cpp
index 72db91a..0622644 100644
--- a/gui/viewers/graph_viewer/graph_viewer.cpp
+++ b/gui/viewers/graph_viewer/graph_viewer.cpp
@@ -5,6 +5,7 @@
 #include <dsr/gui/viewers/graph_viewer/graph_edge.h>
 #include <dsr/gui/viewers/graph_viewer/graph_viewer.h>
 #include <QMessageBox>
+#include <random>
 
 using namespace DSR ;