diff --git a/SabreTools.Helper/Tools/ArchiveTools.cs b/SabreTools.Helper/Tools/ArchiveTools.cs
index eecd9b87..82f48560 100644
--- a/SabreTools.Helper/Tools/ArchiveTools.cs
+++ b/SabreTools.Helper/Tools/ArchiveTools.cs
@@ -1043,9 +1043,15 @@ namespace SabreTools.Helper
 			// Now get the Rom info for the file so we have hashes and size
 			Rom rom = FileTools.GetFileInfo(input, logger);
 
-			// If it doesn't exist, create the output file and then write
+			// Get the output file name
 			string outfile = Path.Combine(outDir, rom.SHA1 + ".gz");
 
+			// If the output file exists, don't try to write again
+			if (File.Exists(outfile))
+			{
+				return true;
+			}
+
 			// Compress the input stream
 			FileStream inputStream = File.OpenRead(input);
 			GZipStream outputStream = new GZipStream(File.Open(outfile, FileMode.Create, FileAccess.Write), CompressionMode.Compress);