diff --git a/OpenSim/Framework/Communications/CAPSService.cs b/OpenSim/Framework/Communications/CAPSService.cs
index 59cfc06530..9cb04a9917 100644
--- a/OpenSim/Framework/Communications/CAPSService.cs
+++ b/OpenSim/Framework/Communications/CAPSService.cs
@@ -32,7 +32,7 @@ namespace OpenSim.Framework.Communications
 {
     public class CAPSService
     {
-        private BaseHttpServer m_server;
+        private readonly BaseHttpServer m_server;
 
         public CAPSService(BaseHttpServer httpServer)
         {
diff --git a/OpenSim/Region/Environment/ModuleLoader.cs b/OpenSim/Region/Environment/ModuleLoader.cs
index 13e7261159..41d8caccff 100644
--- a/OpenSim/Region/Environment/ModuleLoader.cs
+++ b/OpenSim/Region/Environment/ModuleLoader.cs
@@ -43,7 +43,7 @@ namespace OpenSim.Region.Environment
         public Dictionary<string, Assembly> LoadedAssemblys = new Dictionary<string, Assembly>();
 
         private readonly List<IRegionModule> m_loadedModules = new List<IRegionModule>();
-        private Dictionary<string, IRegionModule> m_loadedSharedModules = new Dictionary<string, IRegionModule>();
+        private readonly Dictionary<string, IRegionModule> m_loadedSharedModules = new Dictionary<string, IRegionModule>();
         private readonly LogBase m_log;
         private readonly IConfigSource m_config;
 
diff --git a/OpenSim/Region/Environment/Modules/AvatarFactoryModule.cs b/OpenSim/Region/Environment/Modules/AvatarFactoryModule.cs
index c31a79b7e1..4dd1cb1183 100644
--- a/OpenSim/Region/Environment/Modules/AvatarFactoryModule.cs
+++ b/OpenSim/Region/Environment/Modules/AvatarFactoryModule.cs
@@ -41,7 +41,7 @@ namespace OpenSim.Region.Environment.Modules
     public class AvatarFactoryModule : IAvatarFactory
     {
         private Scene m_scene = null;
-        private Dictionary<LLUUID, AvatarAppearance> m_avatarsAppearance = new Dictionary<LLUUID, AvatarAppearance>();
+        private readonly Dictionary<LLUUID, AvatarAppearance> m_avatarsAppearance = new Dictionary<LLUUID, AvatarAppearance>();
 
         public bool TryGetAvatarAppearance(LLUUID avatarId, out AvatarAppearance appearance)
         {