diff --git a/modules/mono/glue/Managed/Files/AABB.cs b/modules/mono/glue/Managed/Files/AABB.cs
index 33b2b46712f..1bb5e9410ad 100644
--- a/modules/mono/glue/Managed/Files/AABB.cs
+++ b/modules/mono/glue/Managed/Files/AABB.cs
@@ -5,6 +5,7 @@
 // file: core/variant_call.cpp
 // commit: 5ad9be4c24e9d7dc5672fdc42cea896622fe5685
 using System;
+using System.Runtime.InteropServices;
 #if REAL_T_IS_DOUBLE
 using real_t = System.Double;
 #else
@@ -13,6 +14,8 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
     public struct AABB : IEquatable<AABB>
     {
         private Vector3 _position;
diff --git a/modules/mono/glue/Managed/Files/Basis.cs b/modules/mono/glue/Managed/Files/Basis.cs
index ac9576cebd4..35cc1095782 100644
--- a/modules/mono/glue/Managed/Files/Basis.cs
+++ b/modules/mono/glue/Managed/Files/Basis.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Basis : IEquatable<Basis>
     {
diff --git a/modules/mono/glue/Managed/Files/Color.cs b/modules/mono/glue/Managed/Files/Color.cs
index 88fa3323c2d..efc6cfb97e1 100644
--- a/modules/mono/glue/Managed/Files/Color.cs
+++ b/modules/mono/glue/Managed/Files/Color.cs
@@ -1,7 +1,10 @@
 using System;
+using System.Runtime.InteropServices;
 
 namespace Godot
 {
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
     public struct Color : IEquatable<Color>
     {
         public float r;
diff --git a/modules/mono/glue/Managed/Files/Plane.cs b/modules/mono/glue/Managed/Files/Plane.cs
index f11cd490a9e..1e6a62bc613 100644
--- a/modules/mono/glue/Managed/Files/Plane.cs
+++ b/modules/mono/glue/Managed/Files/Plane.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Runtime.InteropServices;
 #if REAL_T_IS_DOUBLE
 using real_t = System.Double;
 #else
@@ -7,6 +8,8 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
     public struct Plane : IEquatable<Plane>
     {
         private Vector3 _normal;
diff --git a/modules/mono/glue/Managed/Files/Quat.cs b/modules/mono/glue/Managed/Files/Quat.cs
index d0c15146a53..0e663ea3f0e 100644
--- a/modules/mono/glue/Managed/Files/Quat.cs
+++ b/modules/mono/glue/Managed/Files/Quat.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Quat : IEquatable<Quat>
     {
diff --git a/modules/mono/glue/Managed/Files/Rect2.cs b/modules/mono/glue/Managed/Files/Rect2.cs
index 888f300347a..f3dc9d84900 100644
--- a/modules/mono/glue/Managed/Files/Rect2.cs
+++ b/modules/mono/glue/Managed/Files/Rect2.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Rect2 : IEquatable<Rect2>
     {
diff --git a/modules/mono/glue/Managed/Files/Transform.cs b/modules/mono/glue/Managed/Files/Transform.cs
index bd79144873d..0010d99d5a7 100644
--- a/modules/mono/glue/Managed/Files/Transform.cs
+++ b/modules/mono/glue/Managed/Files/Transform.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Transform : IEquatable<Transform>
     {
diff --git a/modules/mono/glue/Managed/Files/Transform2D.cs b/modules/mono/glue/Managed/Files/Transform2D.cs
index f7bb41d5239..55ff1787620 100644
--- a/modules/mono/glue/Managed/Files/Transform2D.cs
+++ b/modules/mono/glue/Managed/Files/Transform2D.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Transform2D : IEquatable<Transform2D>
     {
diff --git a/modules/mono/glue/Managed/Files/Vector2.cs b/modules/mono/glue/Managed/Files/Vector2.cs
index 908162ec45a..ba811bce36a 100644
--- a/modules/mono/glue/Managed/Files/Vector2.cs
+++ b/modules/mono/glue/Managed/Files/Vector2.cs
@@ -14,6 +14,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector2 : IEquatable<Vector2>
     {
diff --git a/modules/mono/glue/Managed/Files/Vector3.cs b/modules/mono/glue/Managed/Files/Vector3.cs
index 0c96d346a94..ad2d3faad20 100644
--- a/modules/mono/glue/Managed/Files/Vector3.cs
+++ b/modules/mono/glue/Managed/Files/Vector3.cs
@@ -14,6 +14,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector3 : IEquatable<Vector3>
     {