diff --git a/Grid_config.h b/Grid_config.h
index 8a0fdc26..599afe2e 100644
--- a/Grid_config.h
+++ b/Grid_config.h
@@ -17,7 +17,7 @@
 #define GRID_COMMS_MPI 1
 
 /* GRID_COMMS_NONE */
-/* #undef GRID_COMMS_NONE */
+#define GRID_COMMS_NONE 1
 
 /* Define to 1 if you have the `gettimeofday' function. */
 #define HAVE_GETTIMEOFDAY 1