diff --git a/python/src/bind_DataSetAggregation.hpp b/python/src/bind_DataSetAggregation.hpp
index a12f2fb4..9b2dbcd5 100644
--- a/python/src/bind_DataSetAggregation.hpp
+++ b/python/src/bind_DataSetAggregation.hpp
@@ -1,4 +1,5 @@
 #include "aare/DataSetAggregation.hpp"
+#include "np_helper.hpp"
 
 #include <pybind11/pybind11.h>