diff --git a/fsxc/Fsxc.fs b/fsxc/Fsxc.fs
index 140e32a..ee62e04 100644
--- a/fsxc/Fsxc.fs
+++ b/fsxc/Fsxc.fs
@@ -846,6 +846,9 @@ let fsi = { CommandLineArgs = System.Environment.GetCommandLineArgs() }
         Console.WriteLine("_________________END AUTOGEN FILE_________________")
 #if !LEGACY_FRAMEWORK
         let projectFile = generateProjectFile script contents extraExtensions
+#else // dummy for to just prevent "unused" warning, meh
+        for ext in extraExtensions do
+            ()
 #endif
 
         let exitCode, exeTarget =