diff --git a/rtu/config/system.lua b/rtu/config/system.lua
index b121db9..c44e0ba 100644
--- a/rtu/config/system.lua
+++ b/rtu/config/system.lua
@@ -732,11 +732,8 @@ function system.create(tool_ctl, main_pane, cfg_sys, divs, ext, style)
         local missing = { tmp = true, ini = true }
 
         for iface, _ in pairs(modems) do
-            if ini_cfg.WiredModem == iface then
-                missing.ini = false
-            elseif tmp_cfg.WiredModem == iface then
-                missing.tmp = false
-            end
+            if ini_cfg.WiredModem == iface then missing.ini = false end
+            if tmp_cfg.WiredModem == iface then missing.tmp = false end
         end
 
         if missing.tmp and tmp_cfg.WiredModem then
diff --git a/rtu/configure.lua b/rtu/configure.lua
index 48d2c99..029d91a 100644
--- a/rtu/configure.lua
+++ b/rtu/configure.lua
@@ -324,9 +324,9 @@ function configurator.configure(ask_config)
     tool_ctl.has_config = load_settings(ini_cfg)
 
     -- set tmp_cfg so interface lists are correct
+    tmp_cfg.WiredModem = ini_cfg.WiredModem
     tmp_cfg.Peripherals = tool_ctl.deep_copy_peri(ini_cfg.Peripherals)
     tmp_cfg.Redstone = tool_ctl.deep_copy_rs(ini_cfg.Redstone)
-    tmp_cfg.WiredModem = ini_cfg.WiredModem
 
     reset_term()
 
diff --git a/supervisor/config/system.lua b/supervisor/config/system.lua
index b453832..9b140b6 100644
--- a/supervisor/config/system.lua
+++ b/supervisor/config/system.lua
@@ -886,11 +886,8 @@ function system.create(tool_ctl, main_pane, cfg_sys, divs, fac_pane, style, exit
         local missing = { tmp = true, ini = true }
 
         for iface, _ in pairs(modems) do
-            if ini_cfg.WiredModem == iface then
-                missing.ini = false
-            elseif tmp_cfg.WiredModem == iface then
-                missing.tmp = false
-            end
+            if ini_cfg.WiredModem == iface then missing.ini = false end
+            if tmp_cfg.WiredModem == iface then missing.tmp = false end
         end
 
         if missing.tmp and tmp_cfg.WiredModem then