diff --git a/sim_serial.c b/sim_serial.c
index 123f70e2..2cce47bf 100644
--- a/sim_serial.c
+++ b/sim_serial.c
@@ -974,7 +974,7 @@ for (i=1; (ports < max) && (i < 64); ++i) {
         close (port);
         }
     }
-for (i=1; (ports < max) && (i < 64); ++i) {
+for (i=0; (ports < max) && (i < 64); ++i) {
     sprintf (list[ports].name, "/dev/tty%02d", i);
     port = open (list[ports].name, O_RDWR | O_NOCTTY | O_NONBLOCK);     /* open the port */
     if (port != -1) {                                   /* open OK? */
@@ -983,7 +983,7 @@ for (i=1; (ports < max) && (i < 64); ++i) {
         close (port);
         }
     }
-for (i=1; (ports < max) && (i < 8); ++i) {
+for (i=0; (ports < max) && (i < 8); ++i) {
     sprintf (list[ports].name, "/dev/ttyU%d", i);
     port = open (list[ports].name, O_RDWR | O_NOCTTY | O_NONBLOCK);     /* open the port */
     if (port != -1) {                                   /* open OK? */