diff --git a/src/dhcpd-pools.c b/src/dhcpd-pools.c
index 79afc21..a5cb9d4 100644
--- a/src/dhcpd-pools.c
+++ b/src/dhcpd-pools.c
@@ -198,11 +198,11 @@ static char parse_command_line_opts(struct conf_t *state, int argc, char **argv)
 			{
 				/* Output sorting option */
 				struct output_sort *p = state->sorts;
-				size_t len;
+				char *ptr = optarg;
 
 				while (p && p->next)
 					p = p->next;
-				for (len = 0; len < strlen(optarg); len++) {
+				while (*ptr) {
 					if (state->sorts == NULL) {
 						state->sorts =
 						    xcalloc(1, sizeof(struct output_sort));
@@ -211,7 +211,7 @@ static char parse_command_line_opts(struct conf_t *state, int argc, char **argv)
 						p->next = xcalloc(1, sizeof(struct output_sort));
 						p = p->next;
 					}
-					p->func = field_selector(optarg[len]);
+					p->func = field_selector(*ptr++);
 				}
 			}
 			break;