diff --git a/ExeLauncher/ExeGenerator.cs b/ExeLauncher/ExeGenerator.cs
index cdd1964..4455a7e 100644
--- a/ExeLauncher/ExeGenerator.cs
+++ b/ExeLauncher/ExeGenerator.cs
@@ -28,18 +28,14 @@ namespace ExeLauncher.GUI
 
         private static string Code { get; }
 
-        private string _code;
-
-        public ExeGenerator()
-        {
-            _code = Code;
-        }
-
         public CompilerErrorCollection CreateExecutable(string location, string paths, string arguments, string workingDirectories, string icon)
         {
-            _code = _code.Replace(Paths, paths);
-            _code = _code.Replace(Arguments, arguments);
-            _code = _code.Replace(WorkingDirectories, workingDirectories);
+            // Copy before modifying
+            string code = Code;
+
+            code = code.Replace(Paths, paths);
+            code = code.Replace(Arguments, arguments);
+            code = code.Replace(WorkingDirectories, workingDirectories);
 
             using (var codeProvider = new CSharpCodeProvider())
             {
@@ -51,7 +47,7 @@ namespace ExeLauncher.GUI
                 };
                 compilerParameters.ReferencedAssemblies.Add("System.dll");
 
-                var result = codeProvider.CompileAssemblyFromSource(compilerParameters, _code);
+                var result = codeProvider.CompileAssemblyFromSource(compilerParameters, code);
 
                 if (result.Errors.HasErrors)
                 {