diff --git a/examples/viewer/viewer.cpp b/examples/viewer/viewer.cpp
index 77303fa6..5290758a 100644
--- a/examples/viewer/viewer.cpp
+++ b/examples/viewer/viewer.cpp
@@ -34,6 +34,7 @@
 #include <iostream>
 #include <fstream>
 #include <vector>
+#include <typeinfo>
 
 #include <gtk/gtk.h>