diff --git a/Rules/UseCorrectCasing.cs b/Rules/UseCorrectCasing.cs
index 7c0c20727..6936e0d67 100644
--- a/Rules/UseCorrectCasing.cs
+++ b/Rules/UseCorrectCasing.cs
@@ -32,11 +32,6 @@ public override IEnumerable<DiagnosticRecord> AnalyzeScript(Ast ast, string file
 
             IEnumerable<Ast> commandAsts = ast.FindAll(testAst => testAst is CommandAst, true);
 
-            bool isWindows = true;
-#if CORECLR
-            isWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
-#endif
-
             // Iterates all CommandAsts and check the command name.
             foreach (CommandAst commandAst in commandAsts)
             {