diff --git a/src/Umbraco.Core/IO/FileSystemExtensions.cs b/src/Umbraco.Core/IO/FileSystemExtensions.cs
index a4a40d37ba..6edc52eeb1 100644
--- a/src/Umbraco.Core/IO/FileSystemExtensions.cs
+++ b/src/Umbraco.Core/IO/FileSystemExtensions.cs
@@ -1,6 +1,5 @@
 using System;
 using System.IO;
-using Umbraco.Core.CodeAnnotations;
 
 namespace Umbraco.Core.IO
 {	
@@ -19,7 +18,10 @@ namespace Umbraco.Core.IO
 
         public static void CopyFile(this IFileSystem fs, string path, string newPath)
         {
-            fs.AddFile(newPath, fs.OpenFile(path));
+            using (var fileStream = fs.OpenFile(path))
+            {
+                fs.AddFile(newPath, fileStream);
+            }
         }
 
         public static string GetExtension(this IFileSystem fs, string path)
diff --git a/src/Umbraco.Core/IO/FileSystemWrapper.cs b/src/Umbraco.Core/IO/FileSystemWrapper.cs
index 924485db43..ba2ad8f48b 100644
--- a/src/Umbraco.Core/IO/FileSystemWrapper.cs
+++ b/src/Umbraco.Core/IO/FileSystemWrapper.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using Umbraco.Core.CodeAnnotations;
 
 namespace Umbraco.Core.IO
 {
diff --git a/src/Umbraco.Core/IO/IFileSystem.cs b/src/Umbraco.Core/IO/IFileSystem.cs
index 113f63565c..82baae6fb8 100644
--- a/src/Umbraco.Core/IO/IFileSystem.cs
+++ b/src/Umbraco.Core/IO/IFileSystem.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using Umbraco.Core.CodeAnnotations;
 
 namespace Umbraco.Core.IO
 {
diff --git a/src/Umbraco.Core/IO/PhysicalFileSystem.cs b/src/Umbraco.Core/IO/PhysicalFileSystem.cs
index 74d7f27671..bdba541ea3 100644
--- a/src/Umbraco.Core/IO/PhysicalFileSystem.cs
+++ b/src/Umbraco.Core/IO/PhysicalFileSystem.cs
@@ -3,10 +3,7 @@ using System.Collections.Generic;
 using System.Globalization;
 using System.IO; 
 using System.Linq;
-using System.Web;
-using Umbraco.Core.CodeAnnotations;
 using Umbraco.Core.Logging;
-using Umbraco.Core.Publishing;
 
 namespace Umbraco.Core.IO
 {