diff --git a/Dalamud/Plugin/Internal/Types/PluginDef.cs b/Dalamud/Plugin/Internal/Types/PluginDef.cs
index 25cd82423..f9f49225a 100644
--- a/Dalamud/Plugin/Internal/Types/PluginDef.cs
+++ b/Dalamud/Plugin/Internal/Types/PluginDef.cs
@@ -7,7 +7,7 @@ namespace Dalamud.Plugin.Internal.Types;
 /// <summary>
 /// Plugin Definition.
 /// </summary>
-internal struct PluginDef
+internal readonly struct PluginDef
 {
     /// <summary>
     /// Initializes a new instance of the <see cref="PluginDef"/> struct.