diff --git a/src/DotRecast.Recast/RcAreaModification.cs b/src/DotRecast.Recast/RcAreaModification.cs
index abd33dc..a9946c7 100644
--- a/src/DotRecast.Recast/RcAreaModification.cs
+++ b/src/DotRecast.Recast/RcAreaModification.cs
@@ -24,8 +24,8 @@ namespace DotRecast.Recast
     {
         public const int RC_AREA_FLAGS_MASK = 0x3F;
 
-        public int Value { get; }
-        public int Mask { get; }
+        public readonly int Value;
+        public readonly int Mask;
 
         /**
          * Mask is set to all available bits, which means value is fully applied
@@ -35,7 +35,7 @@ namespace DotRecast.Recast
          */
         public RcAreaModification(int value)
         {
-            this.Value = value;
+            Value = value;
             Mask = RC_AREA_FLAGS_MASK;
         }
 
@@ -48,8 +48,8 @@ namespace DotRecast.Recast
          */
         public RcAreaModification(int value, int mask)
         {
-            this.Value = value;
-            this.Mask = mask;
+            Value = value;
+            Mask = mask;
         }
 
         public RcAreaModification(RcAreaModification other)
diff --git a/test/DotRecast.Detour.Crowd.Test/SampleAreaModifications.cs b/test/DotRecast.Detour.Crowd.Test/SampleAreaModifications.cs
index 612b3aa..9f11338 100644
--- a/test/DotRecast.Detour.Crowd.Test/SampleAreaModifications.cs
+++ b/test/DotRecast.Detour.Crowd.Test/SampleAreaModifications.cs
@@ -30,12 +30,12 @@ public class SampleAreaModifications
     public const int SAMPLE_POLYAREA_TYPE_GRASS = 0x5;
     public const int SAMPLE_POLYAREA_TYPE_JUMP = 0x6;
 
-    public static RcAreaModification SAMPLE_AREAMOD_GROUND = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GROUND, SAMPLE_POLYAREA_TYPE_MASK);
-    public static RcAreaModification SAMPLE_AREAMOD_WATER = new RcAreaModification(SAMPLE_POLYAREA_TYPE_WATER, SAMPLE_POLYAREA_TYPE_MASK);
-    public static RcAreaModification SAMPLE_AREAMOD_ROAD = new RcAreaModification(SAMPLE_POLYAREA_TYPE_ROAD, SAMPLE_POLYAREA_TYPE_MASK);
-    public static RcAreaModification SAMPLE_AREAMOD_GRASS = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GRASS, SAMPLE_POLYAREA_TYPE_MASK);
-    public static RcAreaModification SAMPLE_AREAMOD_DOOR = new RcAreaModification(SAMPLE_POLYAREA_TYPE_DOOR, SAMPLE_POLYAREA_TYPE_DOOR);
-    public static RcAreaModification SAMPLE_AREAMOD_JUMP = new RcAreaModification(SAMPLE_POLYAREA_TYPE_JUMP, SAMPLE_POLYAREA_TYPE_JUMP);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_GROUND = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GROUND, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_WATER = new RcAreaModification(SAMPLE_POLYAREA_TYPE_WATER, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_ROAD = new RcAreaModification(SAMPLE_POLYAREA_TYPE_ROAD, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_GRASS = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GRASS, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_DOOR = new RcAreaModification(SAMPLE_POLYAREA_TYPE_DOOR, SAMPLE_POLYAREA_TYPE_DOOR);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_JUMP = new RcAreaModification(SAMPLE_POLYAREA_TYPE_JUMP, SAMPLE_POLYAREA_TYPE_JUMP);
 
     public const int SAMPLE_POLYFLAGS_WALK = 0x01; // Ability to walk (ground, grass, road)
     public const int SAMPLE_POLYFLAGS_SWIM = 0x02; // Ability to swim (water).
diff --git a/test/DotRecast.Detour.Dynamic.Test/SampleAreaModifications.cs b/test/DotRecast.Detour.Dynamic.Test/SampleAreaModifications.cs
index 42d9cb6..ad46f97 100644
--- a/test/DotRecast.Detour.Dynamic.Test/SampleAreaModifications.cs
+++ b/test/DotRecast.Detour.Dynamic.Test/SampleAreaModifications.cs
@@ -30,23 +30,12 @@ public class SampleAreaModifications
     public const int SAMPLE_POLYAREA_TYPE_GRASS = 0x5;
     public const int SAMPLE_POLYAREA_TYPE_JUMP = 0x6;
 
-    public static RcAreaModification SAMPLE_AREAMOD_GROUND = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GROUND,
-        SAMPLE_POLYAREA_TYPE_MASK);
-
-    public static RcAreaModification SAMPLE_AREAMOD_WATER = new RcAreaModification(SAMPLE_POLYAREA_TYPE_WATER,
-        SAMPLE_POLYAREA_TYPE_MASK);
-
-    public static RcAreaModification SAMPLE_AREAMOD_ROAD = new RcAreaModification(SAMPLE_POLYAREA_TYPE_ROAD,
-        SAMPLE_POLYAREA_TYPE_MASK);
-
-    public static RcAreaModification SAMPLE_AREAMOD_GRASS = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GRASS,
-        SAMPLE_POLYAREA_TYPE_MASK);
-
-    public static RcAreaModification SAMPLE_AREAMOD_DOOR = new RcAreaModification(SAMPLE_POLYAREA_TYPE_DOOR,
-        SAMPLE_POLYAREA_TYPE_DOOR);
-
-    public static RcAreaModification SAMPLE_AREAMOD_JUMP = new RcAreaModification(SAMPLE_POLYAREA_TYPE_JUMP,
-        SAMPLE_POLYAREA_TYPE_JUMP);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_GROUND = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GROUND, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_WATER = new RcAreaModification(SAMPLE_POLYAREA_TYPE_WATER, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_ROAD = new RcAreaModification(SAMPLE_POLYAREA_TYPE_ROAD, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_GRASS = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GRASS, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_DOOR = new RcAreaModification(SAMPLE_POLYAREA_TYPE_DOOR, SAMPLE_POLYAREA_TYPE_DOOR);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_JUMP = new RcAreaModification(SAMPLE_POLYAREA_TYPE_JUMP, SAMPLE_POLYAREA_TYPE_JUMP);
 
     public const int SAMPLE_POLYFLAGS_WALK = 0x01; // Ability to walk (ground, grass, road)
     public const int SAMPLE_POLYFLAGS_SWIM = 0x02; // Ability to swim (water).
diff --git a/test/DotRecast.Detour.Test/SampleAreaModifications.cs b/test/DotRecast.Detour.Test/SampleAreaModifications.cs
index be6d2b2..a594a46 100644
--- a/test/DotRecast.Detour.Test/SampleAreaModifications.cs
+++ b/test/DotRecast.Detour.Test/SampleAreaModifications.cs
@@ -30,23 +30,12 @@ public class SampleAreaModifications
     public const int SAMPLE_POLYAREA_TYPE_GRASS = 0x5;
     public const int SAMPLE_POLYAREA_TYPE_JUMP = 0x6;
 
-    public static RcAreaModification SAMPLE_AREAMOD_GROUND = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GROUND,
-        SAMPLE_POLYAREA_TYPE_MASK);
-
-    public static RcAreaModification SAMPLE_AREAMOD_WATER = new RcAreaModification(SAMPLE_POLYAREA_TYPE_WATER,
-        SAMPLE_POLYAREA_TYPE_MASK);
-
-    public static RcAreaModification SAMPLE_AREAMOD_ROAD = new RcAreaModification(SAMPLE_POLYAREA_TYPE_ROAD,
-        SAMPLE_POLYAREA_TYPE_MASK);
-
-    public static RcAreaModification SAMPLE_AREAMOD_GRASS = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GRASS,
-        SAMPLE_POLYAREA_TYPE_MASK);
-
-    public static RcAreaModification SAMPLE_AREAMOD_DOOR = new RcAreaModification(SAMPLE_POLYAREA_TYPE_DOOR,
-        SAMPLE_POLYAREA_TYPE_DOOR);
-
-    public static RcAreaModification SAMPLE_AREAMOD_JUMP = new RcAreaModification(SAMPLE_POLYAREA_TYPE_JUMP,
-        SAMPLE_POLYAREA_TYPE_JUMP);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_GROUND = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GROUND, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_WATER = new RcAreaModification(SAMPLE_POLYAREA_TYPE_WATER, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_ROAD = new RcAreaModification(SAMPLE_POLYAREA_TYPE_ROAD, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_GRASS = new RcAreaModification(SAMPLE_POLYAREA_TYPE_GRASS, SAMPLE_POLYAREA_TYPE_MASK);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_DOOR = new RcAreaModification(SAMPLE_POLYAREA_TYPE_DOOR, SAMPLE_POLYAREA_TYPE_DOOR);
+    public static readonly RcAreaModification SAMPLE_AREAMOD_JUMP = new RcAreaModification(SAMPLE_POLYAREA_TYPE_JUMP, SAMPLE_POLYAREA_TYPE_JUMP);
 
     public const int SAMPLE_POLYFLAGS_WALK = 0x01; // Ability to walk (ground, grass, road)
     public const int SAMPLE_POLYFLAGS_SWIM = 0x02; // Ability to swim (water).