diff --git a/ParadoxSaveParser.Lib/SearchExpression.cs b/ParadoxSaveParser.Lib/SearchExpression.cs
index 113248d..54c8ac9 100644
--- a/ParadoxSaveParser.Lib/SearchExpression.cs
+++ b/ParadoxSaveParser.Lib/SearchExpression.cs
@@ -1,6 +1,6 @@
 namespace ParadoxSaveParser.Lib;
 
-public record SearchArgs
+public readonly record struct SearchArgs
 {
     public readonly string KeyStr;
     public readonly StringBuilder? KeySB;