diff --git a/lib/Grid_lattice.h b/lib/Grid_lattice.h
index ed875bc0..7256459c 100644
--- a/lib/Grid_lattice.h
+++ b/lib/Grid_lattice.h
@@ -98,7 +98,6 @@ public:
 #include <lattice/Grid_lattice_coordinate.h>
 #include <lattice/Grid_lattice_rng.h>
 #include <lattice/Grid_lattice_transfer.h>
-#include <Grid_summation.h>