diff --git a/src/ICSharpCode.SharpZipLib/Core/PathUtils.cs b/src/ICSharpCode.SharpZipLib/Core/PathUtils.cs
index ddffbfda..95a8af12 100644
--- a/src/ICSharpCode.SharpZipLib/Core/PathUtils.cs
+++ b/src/ICSharpCode.SharpZipLib/Core/PathUtils.cs
@@ -35,7 +35,7 @@ public static string DropPathRoot(string path)
 		/// </summary>
 		/// <param name="orig">If specified, used as the base file name for the temporary file</param>
 		/// <returns>Returns a temporary file name</returns>
-		public static string GetTempFileName(string orig)
+		public static string GetTempFileName(string orig = null)
 		{
 			string fileName;
 			var tempPath = Path.GetTempPath();
diff --git a/src/ICSharpCode.SharpZipLib/Tar/TarArchive.cs b/src/ICSharpCode.SharpZipLib/Tar/TarArchive.cs
index f1bd8f9d..7f6d180e 100644
--- a/src/ICSharpCode.SharpZipLib/Tar/TarArchive.cs
+++ b/src/ICSharpCode.SharpZipLib/Tar/TarArchive.cs
@@ -803,7 +803,7 @@ private void WriteEntryCore(TarEntry sourceEntry, bool recurse)
 			{
 				if (!IsBinary(entryFilename))
 				{
-					tempFileName = Path.GetRandomFileName();
+					tempFileName = PathUtils.GetTempFileName();
 
 					using (StreamReader inStream = File.OpenText(entryFilename))
 					{