diff --git a/SabreTools.Helper/Tools/ArchiveTools.cs b/SabreTools.Helper/Tools/ArchiveTools.cs
index d6f6e645..94aba354 100644
--- a/SabreTools.Helper/Tools/ArchiveTools.cs
+++ b/SabreTools.Helper/Tools/ArchiveTools.cs
@@ -191,7 +191,7 @@ namespace SabreTools.Helper
 
 					using (FileStream itemstream = File.OpenRead(input))
 					{
-						using (FileStream outstream = File.Create(tempdir + Path.GetFileNameWithoutExtension(input)))
+						using (FileStream outstream = File.Create(Path.Combine(tempdir, Path.GetFileNameWithoutExtension(input))))
 						{
 							using (GZipStream gzstream = new GZipStream(itemstream, CompressionMode.Decompress))
 							{