diff --git a/Lib/csharp/std_wstring.i b/Lib/csharp/std_wstring.i
index 87c9a9f15..d45471014 100644
--- a/Lib/csharp/std_wstring.i
+++ b/Lib/csharp/std_wstring.i
@@ -50,8 +50,8 @@ class wstring;
 %typemap(imtype,
          inattributes="[global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]",
          outattributes="[return: global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]",
-         directorinattributes="[global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]",
-         directoroutattributes="[return: global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]"
+         directorinattributes="[global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]",
+         directoroutattributes="[return: global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]"
          ) wstring "string"
 %typemap(cstype) wstring "string"
 %typemap(csdirectorin) wstring "$iminput"
@@ -91,8 +91,8 @@ class wstring;
 %typemap(imtype,
          inattributes="[global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]",
          outattributes="[return: global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]",
-         directorinattributes="[global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]",
-         directoroutattributes="[return: global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]"
+         directorinattributes="[global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]",
+         directoroutattributes="[return: global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPWStr)]"
          ) const wstring & "string"
 %typemap(cstype) const wstring & "string"