diff --git a/src/Microsoft.PowerShell.Commands.Diagnostics/CommonUtils.cs b/src/Microsoft.PowerShell.Commands.Diagnostics/CommonUtils.cs
index 205b13fd191..ba18db34943 100644
--- a/src/Microsoft.PowerShell.Commands.Diagnostics/CommonUtils.cs
+++ b/src/Microsoft.PowerShell.Commands.Diagnostics/CommonUtils.cs
@@ -5,16 +5,10 @@
 using System.Collections;
 using System.Diagnostics;
 using System.Globalization;
+using System.Reflection;
+using System.Resources;
 using System.Runtime.InteropServices;
 using System.Text;
-using System.Resources;
-using System.Reflection;
-
-#if CORECLR
-using System.ComponentModel;
-#else
-using System.Threading;
-#endif
 
 namespace Microsoft.PowerShell.Commands.Diagnostics.Common
 {
@@ -38,7 +32,6 @@ public static string StringArrayToString(IEnumerable input)
             return ret;
         }
 
-#if CORECLR
         private const string LibraryLoadDllName = "api-ms-win-core-libraryloader-l1-2-0.dll";
         private const string LocalizationDllName = "api-ms-win-core-localization-l1-2-1.dll";
         private const string SysInfoDllName = "api-ms-win-core-sysinfo-l1-2-1.dll";
@@ -62,10 +55,6 @@ internal struct OSVERSIONINFOEX
 
         [DllImport(SysInfoDllName, CharSet = CharSet.Unicode, SetLastError = true)]
         internal static extern bool GetVersionEx(ref OSVERSIONINFOEX osVerEx);
-#else
-        private const string LibraryLoadDllName = "kernel32.dll";
-        private const string LocalizationDllName = "kernel32.dll";
-#endif
 
         private const uint FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100;
         private const uint FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200;
diff --git a/src/Microsoft.WSMan.Management/CredSSP.cs b/src/Microsoft.WSMan.Management/CredSSP.cs
index b3e6b40edf4..cf08ea831cc 100644
--- a/src/Microsoft.WSMan.Management/CredSSP.cs
+++ b/src/Microsoft.WSMan.Management/CredSSP.cs
@@ -18,9 +18,6 @@
 using System.Globalization;
 using System.Security;
 using System.Threading;
-#if CORECLR
-using System.Xml.XPath;
-#endif
 
 using Dbg = System.Management.Automation;
 
diff --git a/src/Microsoft.WSMan.Management/WsManHelper.cs b/src/Microsoft.WSMan.Management/WsManHelper.cs
index 2ef2164e166..89c8c52afa0 100644
--- a/src/Microsoft.WSMan.Management/WsManHelper.cs
+++ b/src/Microsoft.WSMan.Management/WsManHelper.cs
@@ -17,9 +17,6 @@
 using System.Management.Automation;
 using System.Management.Automation.Provider;
 using System.Threading;
-#if CORECLR
-using System.Xml.XPath;
-#endif
 
 namespace Microsoft.WSMan.Management
 {
diff --git a/src/System.Management.Automation/engine/hostifaces/InternalHost.cs b/src/System.Management.Automation/engine/hostifaces/InternalHost.cs
index bb94e75ef9d..8615cb40f68 100644
--- a/src/System.Management.Automation/engine/hostifaces/InternalHost.cs
+++ b/src/System.Management.Automation/engine/hostifaces/InternalHost.cs
@@ -190,11 +190,7 @@ public override CultureInfo CurrentUICulture
         {
             get
             {
-#if CORECLR     // No CultureInfo.InstalledUICulture In CoreCLR. Locale cannot be changed On CSS.
-                CultureInfo ci = _externalHostRef.Value.CurrentUICulture ?? CultureInfo.CurrentUICulture;
-#else
                 CultureInfo ci = _externalHostRef.Value.CurrentUICulture ?? CultureInfo.InstalledUICulture;
-#endif
                 return ci;
             }
         }