diff --git a/src/paraviewo/HDF5VTUWriter.hpp b/src/paraviewo/HDF5VTUWriter.hpp
index adee54e..a440076 100644
--- a/src/paraviewo/HDF5VTUWriter.hpp
+++ b/src/paraviewo/HDF5VTUWriter.hpp
@@ -11,6 +11,8 @@
 #include <iostream>
 #include <vector>
 #include <array>
+#include <cassert>
+
 
 namespace paraviewo
 {