diff --git a/src/System.Management.Automation/namespaces/AliasProvider.cs b/src/System.Management.Automation/namespaces/AliasProvider.cs
index d6b99155630..485ac781820 100644
--- a/src/System.Management.Automation/namespaces/AliasProvider.cs
+++ b/src/System.Management.Automation/namespaces/AliasProvider.cs
@@ -1,7 +1,6 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
-using System;
 using System.Collections;
 using System.Collections.ObjectModel;
 using System.Management.Automation;
diff --git a/src/System.Management.Automation/namespaces/DriveProviderBase.cs b/src/System.Management.Automation/namespaces/DriveProviderBase.cs
index d69f17e94ee..221c4379f54 100644
--- a/src/System.Management.Automation/namespaces/DriveProviderBase.cs
+++ b/src/System.Management.Automation/namespaces/DriveProviderBase.cs
@@ -4,8 +4,6 @@
 using System.Collections.ObjectModel;
 using System.Management.Automation.Internal;
 
-using Dbg = System.Management.Automation;
-
 namespace System.Management.Automation.Provider
 {
     #region DriveCmdletProvider
diff --git a/src/System.Management.Automation/namespaces/FunctionProvider.cs b/src/System.Management.Automation/namespaces/FunctionProvider.cs
index 1843d1edff8..03a58d9f85b 100644
--- a/src/System.Management.Automation/namespaces/FunctionProvider.cs
+++ b/src/System.Management.Automation/namespaces/FunctionProvider.cs
@@ -1,7 +1,6 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
-using System;
 using System.Collections;
 using System.Collections.ObjectModel;
 using System.Management.Automation;
diff --git a/src/System.Management.Automation/namespaces/NavigationProviderBase.cs b/src/System.Management.Automation/namespaces/NavigationProviderBase.cs
index 42dd3b32b36..6732f6e7af8 100644
--- a/src/System.Management.Automation/namespaces/NavigationProviderBase.cs
+++ b/src/System.Management.Automation/namespaces/NavigationProviderBase.cs
@@ -3,7 +3,6 @@
 
 using System.Collections.Generic;
 using System.Management.Automation.Internal;
-using System.Text;
 
 namespace System.Management.Automation.Provider
 {
diff --git a/src/System.Management.Automation/namespaces/PathInfo.cs b/src/System.Management.Automation/namespaces/PathInfo.cs
index cd91845f84c..e4b1f12ddc7 100644
--- a/src/System.Management.Automation/namespaces/PathInfo.cs
+++ b/src/System.Management.Automation/namespaces/PathInfo.cs
@@ -1,8 +1,6 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
-using Dbg = System.Management.Automation;
-
 namespace System.Management.Automation
 {
     /// <summary>
diff --git a/src/System.Management.Automation/namespaces/ProviderBase.cs b/src/System.Management.Automation/namespaces/ProviderBase.cs
index 326d4d51b04..8d6b8f243aa 100644
--- a/src/System.Management.Automation/namespaces/ProviderBase.cs
+++ b/src/System.Management.Automation/namespaces/ProviderBase.cs
@@ -9,7 +9,6 @@
 using System.Management.Automation.Runspaces;
 using System.Management.Automation.Internal;
 using System.Management.Automation.Host;
-using System.Reflection;
 using System.Resources;
 using System.Diagnostics.CodeAnalysis; // for fxcop
 using System.Security.AccessControl;
diff --git a/src/System.Management.Automation/namespaces/RegistrySecurity.cs b/src/System.Management.Automation/namespaces/RegistrySecurity.cs
index e2452a4e0f9..ad355ac6638 100644
--- a/src/System.Management.Automation/namespaces/RegistrySecurity.cs
+++ b/src/System.Management.Automation/namespaces/RegistrySecurity.cs
@@ -3,7 +3,6 @@
 
 #if !UNIX
 
-using System;
 using System.Management.Automation;
 using System.Management.Automation.Provider;
 using System.Security.AccessControl;
diff --git a/src/System.Management.Automation/namespaces/Win32Native.cs b/src/System.Management.Automation/namespaces/Win32Native.cs
index 5833f347b6b..b9c7d8a7a71 100644
--- a/src/System.Management.Automation/namespaces/Win32Native.cs
+++ b/src/System.Management.Automation/namespaces/Win32Native.cs
@@ -16,16 +16,10 @@ namespace Microsoft.PowerShell.Commands.Internal
 {
     using System;
     using System.Security;
-    using System.Text;
     using System.Runtime.InteropServices;
     using System.Runtime.Versioning;
     using System.Management.Automation;
     using System.Diagnostics.CodeAnalysis;
-    using System.Runtime.ConstrainedExecution;
-
-    using BOOL = System.Int32;
-    using DWORD = System.UInt32;
-    using ULONG = System.UInt32;
 
     /**
      * Win32 encapsulation for MSCORLIB.