diff --git a/ExtLibs/Comms/MissionPlanner.Comms.csproj b/ExtLibs/Comms/MissionPlanner.Comms.csproj
index b5ada09404..37a551e170 100644
--- a/ExtLibs/Comms/MissionPlanner.Comms.csproj
+++ b/ExtLibs/Comms/MissionPlanner.Comms.csproj
@@ -24,6 +24,7 @@
     <Compile Remove="System.IO.Ports\**" />
     <EmbeddedResource Remove="System.IO.Ports\**" />
     <None Remove="System.IO.Ports\**" />
+    <Compile Remove="CommsWinUSB.cs" Condition="'$(OS)' != 'Windows_NT'" />
   </ItemGroup>
 	
 	<ItemGroup>
@@ -44,7 +45,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\Interfaces\Interfaces.csproj" />
-    <ProjectReference Include="..\WinUSBNet\Nefarius.Drivers.WinUSB.csproj" />
+    <ProjectReference Include="..\WinUSBNet\Nefarius.Drivers.WinUSB.csproj" Condition="'$(OS)' == 'Windows_NT'" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/MainV2.cs b/MainV2.cs
index 98ae5fdfe0..a9ca4b344c 100644
--- a/MainV2.cs
+++ b/MainV2.cs
@@ -3601,14 +3601,18 @@ protected override void OnLoad(EventArgs e)
                 if (Environment.OSVersion.Platform == PlatformID.Win32NT)
                     MissionPlanner.Comms.CommsBLE.SerialPort_GetCustomPorts();
 
+#if !LIB
                 MissionPlanner.Comms.CommsWinUSB.SerialPort_GetCustomPorts();
+#endif
             }
             catch { }
 
             // add the custom port creator
             CustomPortList.Add(new Regex("BLE_.*"), (s1, s2) => { return new CommsBLE() { PortName = s1, BaudRate = int.Parse(s2) }; });
 
+#if !LIB
             CustomPortList.Add(new Regex("WINUSB_VID_.*"), (s1, s2) => { return new CommsWinUSB() { PortName = s1, BaudRate = int.Parse(s2) }; });
+#endif
 
             this.ResumeLayout();