diff --git a/OSCADSharp/OSCADSharp/Internal/Bindings/BindableBoolean.cs b/OSCADSharp/OSCADSharp/Internal/Bindings/BindableBoolean.cs
index 9c25dc1..f7468d9 100644
--- a/OSCADSharp/OSCADSharp/Internal/Bindings/BindableBoolean.cs
+++ b/OSCADSharp/OSCADSharp/Internal/Bindings/BindableBoolean.cs
@@ -8,7 +8,7 @@ namespace OSCADSharp
 {
     internal class BindableBoolean : IBindable
     {
-        public string InnerValue
+        internal string InnerValue
         {
             get;
             set;
@@ -33,7 +33,7 @@ namespace OSCADSharp
 
         private string boundProperty = null;
 
-        public bool IsBound { get; set; } = false;
+        internal bool IsBound { get; set; } = false;
         public void Bind(string property, Variable variable)
         {
             this.IsBound = true;
diff --git a/OSCADSharp/OSCADSharp/Internal/Bindings/IBindable.cs b/OSCADSharp/OSCADSharp/Internal/Bindings/IBindable.cs
index b7b4037..c1c9b98 100644
--- a/OSCADSharp/OSCADSharp/Internal/Bindings/IBindable.cs
+++ b/OSCADSharp/OSCADSharp/Internal/Bindings/IBindable.cs
@@ -9,7 +9,7 @@ namespace OSCADSharp
     /// <summary>
     /// An object whose properties can be bound to variables
     /// </summary>
-    public interface IBindable
+    internal interface IBindable
     {
         /// <summary>
         /// Binds a variable to property of this object
diff --git a/OSCADSharp/OSCADSharp/Internal/Files/DefaultFileInvoker.cs b/OSCADSharp/OSCADSharp/Internal/Files/DefaultFileInvoker.cs
index b909cad..91c3d31 100644
--- a/OSCADSharp/OSCADSharp/Internal/Files/DefaultFileInvoker.cs
+++ b/OSCADSharp/OSCADSharp/Internal/Files/DefaultFileInvoker.cs
@@ -9,7 +9,7 @@ namespace OSCADSharp
 {
     internal class DefaultFileInvoker : IFileInvoker
     {
-        private string filePath;
+        private readonly string filePath;
         public DefaultFileInvoker(string filePath)
         {
             this.filePath = filePath;
diff --git a/OSCADSharp/OSCADSharp/Internal/Scripting/Solids/CubeScriptBuilder.cs b/OSCADSharp/OSCADSharp/Internal/Scripting/Solids/CubeScriptBuilder.cs
index f2e26a8..f027835 100644
--- a/OSCADSharp/OSCADSharp/Internal/Scripting/Solids/CubeScriptBuilder.cs
+++ b/OSCADSharp/OSCADSharp/Internal/Scripting/Solids/CubeScriptBuilder.cs
@@ -11,7 +11,7 @@ namespace OSCADSharp
         private CubeBindings bindings;
         private Cube cube;
 
-        public CubeScriptBuilder(CubeBindings bindings, Cube cube)
+        internal CubeScriptBuilder(CubeBindings bindings, Cube cube)
         {
             this.bindings = bindings;
             this.cube = cube;