diff --git a/Duplicati/CommandLine/Decrypter/Program.cs b/Duplicati/CommandLine/Decrypter/Program.cs
index 1f102be38..230e7807f 100644
--- a/Duplicati/CommandLine/Decrypter/Program.cs
+++ b/Duplicati/CommandLine/Decrypter/Program.cs
@@ -28,7 +28,7 @@ namespace Duplicati.CommandLine.Decrypter
     {
         static void Main(string[] args)
         {
-            if (args.Length == 3)
+            if (args.Length != 3)
             {
                 Console.WriteLine(Strings.Program.Usage);
                 return;