diff --git a/kokkos-testing/fd_catalog/fd_wave_cpu.hpp b/kokkos-testing/fd_catalog/fd_wave_cpu.hpp
index 99c5395562c3626b0230308d97d7fb0859d10615..ae9c2b0595707a0499351e231ec7d8980bb5ef9d 100644
--- a/kokkos-testing/fd_catalog/fd_wave_cpu.hpp
+++ b/kokkos-testing/fd_catalog/fd_wave_cpu.hpp
@@ -10,6 +10,7 @@
 #include <cassert>
 #include <list>
 #include <cmath>
+#include <functional>
 
 #include "fd_grid.hpp"
 #include "fd_dataio.hpp"