diff --git a/src/Nino.Generator/UnsafeAccessorGenerator.cs b/src/Nino.Generator/UnsafeAccessorGenerator.cs
index 9275484..da385b0 100644
--- a/src/Nino.Generator/UnsafeAccessorGenerator.cs
+++ b/src/Nino.Generator/UnsafeAccessorGenerator.cs
@@ -33,6 +33,7 @@ private static void Execute(Compilation compilation, ImmutableArray<CSharpSyntax
                 _) = ninoSymbols.GetInheritanceMap();
 
             var sb = new StringBuilder();
+            var generatedTypes = new HashSet<ITypeSymbol>(SymbolEqualityComparer.Default);
 
             foreach (var typeSymbol in ninoSymbols)
             {
@@ -50,6 +51,11 @@ private static void Execute(Compilation compilation, ImmutableArray<CSharpSyntax
                     void WriteMembers(List<NinoTypeHelper.NinoMember> members, ITypeSymbol type,
                         string typeName)
                     {
+                        if (!generatedTypes.Add(type))
+                        {
+                            return;
+                        }
+                        
                         foreach (var (name, declaredType, _, _, isPrivate, isProperty) in members)
                         {
                             if (!isPrivate)
diff --git a/src/Nino.UnitTests/SimpleTests.cs b/src/Nino.UnitTests/SimpleTests.cs
index 6aa8b10..058dbce 100644
--- a/src/Nino.UnitTests/SimpleTests.cs
+++ b/src/Nino.UnitTests/SimpleTests.cs
@@ -13,11 +13,19 @@ public class SimpleTests
         [TestMethod]
         public void TestPrivateAccess()
         {
+            TestPrivateMemberClass pcls = new TestPrivateMemberClass();
+            pcls.A = 1;
+            
+            byte[] bytes = pcls.Serialize();
+            Deserializer.Deserialize(bytes, out TestPrivateMemberClass pcls2);
+            Assert.AreEqual(pcls.A, pcls2.A);
+            Assert.AreEqual(pcls.ReadonlyId, pcls2.ReadonlyId);
+            
             RecordWithPrivateMember record = new RecordWithPrivateMember("Test");
             Assert.IsNotNull(record.Name);
             Assert.AreEqual("Test", record.Name);
             
-            byte[] bytes = record.Serialize();
+            bytes = record.Serialize();
             Deserializer.Deserialize(bytes, out RecordWithPrivateMember r1);
             Assert.AreEqual(record.Name, r1.Name);
             Assert.AreEqual(record.ReadonlyId, r1.ReadonlyId);
diff --git a/src/Nino.UnitTests/TestClass.cs b/src/Nino.UnitTests/TestClass.cs
index 8a11a05..d33e651 100644
--- a/src/Nino.UnitTests/TestClass.cs
+++ b/src/Nino.UnitTests/TestClass.cs
@@ -7,6 +7,23 @@
 
 namespace Nino.UnitTests
 {
+    [NinoType]
+    public
+#if !NET8_0_OR_GREATER
+        partial
+#endif
+        class TestPrivateMemberClass : Base
+    {
+        private int Id { get; set; }
+
+        public int ReadonlyId => Id;
+        
+        public TestPrivateMemberClass()
+        {
+            Id = Random.Shared.Next();
+        }
+    }
+    
     [NinoType]
     public
 #if !NET8_0_OR_GREATER