diff --git a/datatop/src/datatop.c b/datatop/src/datatop.c
index fba26e1..8da6539 100644
--- a/datatop/src/datatop.c
+++ b/datatop/src/datatop.c
@@ -200,7 +200,7 @@
 	}
 
 	if (usr_cl_opts.iptables_rules_routes == OPT_CHOSE) {
-		if (!usr_cl_opts.out_dir) {
+		if (!strlen(usr_cl_opts.out_dir)) {
 			printf("Please provide an out directory.\n");
 			exit(EXIT_FAILURE);
 		}