diff --git a/cmd_parser.c b/cmd_parser.c
index 66b05bd..e86c1e9 100644
--- a/cmd_parser.c
+++ b/cmd_parser.c
@@ -573,7 +573,7 @@ void parse_isolate(void)
     }
 
 	if (cmd_compare(2, "off")) {
-		for (uint8_t i = machine.min_port; i < machine.max_port; i++)
+		for (uint8_t i = machine.min_port; i <= machine.max_port; i++)
 			members |= ((uint16_t)1) << i;
 		members |= 0x200; // CPU-port
 		port_isolate(port_configured, members);