diff --git a/src/navier-stokes.c b/src/navier-stokes.c
index 453e2c2..ab56a7e 100644
--- a/src/navier-stokes.c
+++ b/src/navier-stokes.c
@@ -180,7 +180,7 @@ int eea(
       remove_entry(params, "starting_time");
       remove_entry(params, "init");
       remove_entry(params, "nsteps");
-      fprintf(savefile," -p \"%s;starting_time=%lu;nsteps=%lu;init=file:%s\"", params, t+1, nsteps-t-1, savefile_string);
+      fprintf(savefile," -p \"%s;starting_time=%lu;nsteps=%lu;init=file:%s\"", params, t+1, (nsteps == 0 ? 0 : nsteps-t-1), savefile_string);
       free(params);
 
       fprintf(savefile," energy\n");