diff --git a/src/synergia/utils/tests/test_hdf5_write_mpi.cc b/src/synergia/utils/tests/test_hdf5_write_mpi.cc
index 573235fdf..348ce4719 100644
--- a/src/synergia/utils/tests/test_hdf5_write_mpi.cc
+++ b/src/synergia/utils/tests/test_hdf5_write_mpi.cc
@@ -1,4 +1,4 @@
-
+#include <numeric>
 
 #include <catch2/catch_test_macros.hpp>