4 files changed, 4 insertions, 4 deletions
diff --git a/ARMeilleure/CodeGen/RegisterAllocators/AllocationResult.cs b/ARMeilleure/CodeGen/RegisterAllocators/AllocationResult.cs
index 94ac6991..43e5c7e2 100644
--- a/ARMeilleure/CodeGen/RegisterAllocators/AllocationResult.cs
+++ b/ARMeilleure/CodeGen/RegisterAllocators/AllocationResult.cs
@@ -1,6 +1,6 @@
 namespace ARMeilleure.CodeGen.RegisterAllocators
 {
-    struct AllocationResult
+    readonly struct AllocationResult
     {
         public int IntUsedRegisters { get; }
         public int VecUsedRegisters { get; }
diff --git a/ARMeilleure/CodeGen/RegisterAllocators/CopyResolver.cs b/ARMeilleure/CodeGen/RegisterAllocators/CopyResolver.cs
index df4b6db1..587b1a02 100644
--- a/ARMeilleure/CodeGen/RegisterAllocators/CopyResolver.cs
+++ b/ARMeilleure/CodeGen/RegisterAllocators/CopyResolver.cs
@@ -11,7 +11,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
     {
         private class ParallelCopy
         {
-            private struct Copy
+            private readonly struct Copy
             {
                 public Register Dest   { get; }
                 public Register Source { get; }
diff --git a/ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs b/ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs
index de084026..25952c77 100644
--- a/ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs
+++ b/ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs
@@ -11,7 +11,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
 {
     class HybridAllocator : IRegisterAllocator
     {
-        private struct BlockInfo
+        private readonly struct BlockInfo
         {
             public bool HasCall { get; }
 
diff --git a/ARMeilleure/CodeGen/RegisterAllocators/RegisterMasks.cs b/ARMeilleure/CodeGen/RegisterAllocators/RegisterMasks.cs
index 9652224e..5b11aac2 100644
--- a/ARMeilleure/CodeGen/RegisterAllocators/RegisterMasks.cs
+++ b/ARMeilleure/CodeGen/RegisterAllocators/RegisterMasks.cs
@@ -3,7 +3,7 @@ using System;
 
 namespace ARMeilleure.CodeGen.RegisterAllocators
 {
-    struct RegisterMasks
+    readonly struct RegisterMasks
     {
         public int IntAvailableRegisters   { get; }
         public int VecAvailableRegisters   { get; }