diff --git a/src/System.Management.Automation/namespaces/Win32Native.cs b/src/System.Management.Automation/namespaces/Win32Native.cs
index 5c668fd471..4f2c65c49f 100644
--- a/src/System.Management.Automation/namespaces/Win32Native.cs
+++ b/src/System.Management.Automation/namespaces/Win32Native.cs
@@ -76,14 +76,14 @@ namespace Microsoft.PowerShell.Commands.Internal
 
         #region Struct
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct SID_AND_ATTRIBUTES
         {
             internal IntPtr Sid;
             internal uint Attributes;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct TOKEN_USER
         {
             internal SID_AND_ATTRIBUTES User;
diff --git a/src/System.Management.Automation/security/SecureStringHelper.cs b/src/System.Management.Automation/security/SecureStringHelper.cs
index d06e33f956..5ff5881bab 100644
--- a/src/System.Management.Automation/security/SecureStringHelper.cs
+++ b/src/System.Management.Automation/security/SecureStringHelper.cs
@@ -594,7 +594,7 @@ namespace Microsoft.PowerShell
         internal const int E_FILENOTFOUND = unchecked((int)0x80070002); // File not found
         internal const int ERROR_FILE_NOT_FOUND = 2;                    // File not found
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct CRYPTOAPI_BLOB
         {
             internal uint cbData;
diff --git a/src/System.Management.Automation/security/nativeMethods.cs b/src/System.Management.Automation/security/nativeMethods.cs
index ae880e0551..6dd8f59d61 100644
--- a/src/System.Management.Automation/security/nativeMethods.cs
+++ b/src/System.Management.Automation/security/nativeMethods.cs
@@ -1287,28 +1287,28 @@ namespace System.Management.Automation.Security
             UNPROTECTED_SACL_SECURITY_INFORMATION = 0x10000000
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct LUID
         {
             internal uint LowPart;
             internal uint HighPart;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct LUID_AND_ATTRIBUTES
         {
             internal LUID Luid;
             internal uint Attributes;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct TOKEN_PRIVILEGE
         {
             internal uint PrivilegeCount;
             internal LUID_AND_ATTRIBUTES Privilege;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct ACL
         {
             internal byte AclRevision;
@@ -1318,7 +1318,7 @@ namespace System.Management.Automation.Security
             internal ushort Sbz2;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct ACE_HEADER
         {
             internal byte AceType;
@@ -1326,7 +1326,7 @@ namespace System.Management.Automation.Security
             internal ushort AceSize;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct SYSTEM_AUDIT_ACE
         {
             internal ACE_HEADER Header;
@@ -1334,7 +1334,7 @@ namespace System.Management.Automation.Security
             internal uint SidStart;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct LSA_UNICODE_STRING
         {
             internal ushort Length;
@@ -1342,7 +1342,7 @@ namespace System.Management.Automation.Security
             internal IntPtr Buffer;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct CENTRAL_ACCESS_POLICY
         {
             internal IntPtr CAPID;
diff --git a/src/System.Management.Automation/utils/PlatformInvokes.cs b/src/System.Management.Automation/utils/PlatformInvokes.cs
index fbd4117e84..f9e78f5d1d 100644
--- a/src/System.Management.Automation/utils/PlatformInvokes.cs
+++ b/src/System.Management.Automation/utils/PlatformInvokes.cs
@@ -444,28 +444,28 @@ namespace System.Management.Automation
                                                           out TOKEN_PRIVILEGE previousPrivilegeState,
                                                           ref int returnLength);
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct TOKEN_PRIVILEGE
         {
             internal uint PrivilegeCount;
             internal LUID_AND_ATTRIBUTES Privilege;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct LUID
         {
             internal uint LowPart;
             internal uint HighPart;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct LUID_AND_ATTRIBUTES
         {
             internal LUID Luid;
             internal uint Attributes;
         }
 
-        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+        [StructLayout(LayoutKind.Sequential)]
         internal struct PRIVILEGE_SET
         {
             internal uint PrivilegeCount;