diff --git a/BinaryObjectScanner/ProtectionProgress.cs b/BinaryObjectScanner/ProtectionProgress.cs
index bee13d6e..27ea7ea6 100644
--- a/BinaryObjectScanner/ProtectionProgress.cs
+++ b/BinaryObjectScanner/ProtectionProgress.cs
@@ -12,17 +12,17 @@
         /// <summary>
         /// Filename to report progress for
         /// </summary>
-        public string? Filename { get; private set; }
+        public readonly string? Filename { get; }
 
         /// <summary>
         /// Value between 0 and 1 representign the percentage completed
         /// </summary>
-        public float Percentage { get; private set; }
+        public readonly float Percentage { get; }
 
         /// <summary>
         /// Protection information to report
         /// </summary>
-        public string? Protection { get; private set; }
+        public readonly string? Protection { get; }
 
         public ProtectionProgress(string? filename, float percentage, string? protection)
         {