diff --git a/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/main/kotlin/io/github/springwolf/addons/kotlinx_serialization_model_converter/converter/KotlinxSerializationModelConverter.kt b/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/main/kotlin/io/github/springwolf/addons/kotlinx_serialization_model_converter/converter/KotlinxSerializationModelConverter.kt
index 8af081b9f..68c779e56 100644
--- a/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/main/kotlin/io/github/springwolf/addons/kotlinx_serialization_model_converter/converter/KotlinxSerializationModelConverter.kt
+++ b/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/main/kotlin/io/github/springwolf/addons/kotlinx_serialization_model_converter/converter/KotlinxSerializationModelConverter.kt
@@ -25,13 +25,14 @@ class KotlinxSerializationModelConverter(private val useFqn: Boolean = false) :
         annotatedType: AnnotatedType, context: ModelConverterContext, chain: Iterator<ModelConverter>
     ): Schema<*>? {
         if (annotatedType.type is Class<*>) {
-            val kClass = (annotatedType.type as Class<*>).kotlin
+            val jClass = annotatedType.type as Class<*>
+            val kClass = jClass.kotlin
             val isKotlinSerializable = kClass.findAnnotation<Serializable>() != null
 
             if (isKotlinSerializable) {
                 val schema = ObjectSchema()
                 schema.nullable = false
-                schema.name = kClass.simpleName
+                schema.name = getClassName(jClass)
 
                 kClass.memberProperties.forEach { property ->
                     val propertySchema = getPropertySchema(property, context)
@@ -94,8 +95,10 @@ class KotlinxSerializationModelConverter(private val useFqn: Boolean = false) :
     private fun resolveRefSchema(type: Type, context: ModelConverterContext): Schema<*> {
         val typeSchema = context.resolve(AnnotatedType(type))
         if (typeSchema.type == "object") {
-            val name = getClassName(type as Class<*>)
-            context.defineModel(name, typeSchema)
+            val typeClass = type as Class<*>
+            val name = getClassName(typeClass)
+            // Deletes any previously defined model with the simpleName
+            context.defineModel(name, typeSchema, type, typeClass.simpleName)
             return Schema<Any>().`$ref`(RefUtils.constructRef(name))
         }
         return typeSchema
diff --git a/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/java/io/github/springwolf/addons/kotlinx_serialization_model_converter/converter/KotlinxSerializationTypeConverterTest.java b/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/java/io/github/springwolf/addons/kotlinx_serialization_model_converter/converter/KotlinxSerializationTypeConverterTest.java
index 89934d490..86f94962c 100644
--- a/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/java/io/github/springwolf/addons/kotlinx_serialization_model_converter/converter/KotlinxSerializationTypeConverterTest.java
+++ b/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/java/io/github/springwolf/addons/kotlinx_serialization_model_converter/converter/KotlinxSerializationTypeConverterTest.java
@@ -129,7 +129,7 @@ void testClassWithNestedProperty() {
             assertThat(nestedClass.getType()).isNull();
             assertThat(nestedClass.get$ref()).isEqualTo("#/components/schemas/ClassWithNestedProperty$NestedClass");
 
-            final Schema<?> nestedModel = result.get(ClassWithNestedProperty.NestedClass.class.getSimpleName());
+            final Schema<?> nestedModel = result.get("ClassWithNestedProperty$NestedClass");
             assertThat(nestedModel).isNotNull();
             assertThat(nestedModel.getType()).isEqualTo("object");
             assertThat(nestedModel.getProperties()).hasSize(3);
@@ -144,8 +144,7 @@ void serializeKotlin() {
         converters.addConverter(modelConverter);
 
         var media = converters.readAll(new AnnotatedType(SampleEvent.class));
-        // FIXME: The NestedClass is duplicated
-        assertThat(media).hasSize(3);
+        assertThat(media).hasSize(2);
         final Schema<?> model = media.get(SampleEvent.class.getSimpleName());
         assertThat(model).isNotNull();
         assertThat(model.getType()).isEqualTo("object");
diff --git a/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/resources/fqn.json b/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/resources/fqn.json
index 216ff335e..b282c6f23 100644
--- a/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/resources/fqn.json
+++ b/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/resources/fqn.json
@@ -1,22 +1,5 @@
 {
-  "NestedClass" : {
-    "type" : "object",
-    "properties" : {
-      "color" : {
-        "type" : "string",
-        "enum" : [ "RED", "GREEN", "BLUE" ]
-      },
-      "id" : {
-        "type" : "integer",
-        "format" : "int32"
-      },
-      "name" : {
-        "type" : "string"
-      }
-    },
-    "required" : [ "color", "id", "name" ]
-  },
-  "SampleEvent" : {
+  "io.github.springwolf.addons.kotlinx_serialization_model_converter.converter.SampleEvent" : {
     "type" : "object",
     "properties" : {
       "boolean_field" : {
diff --git a/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/resources/simple.json b/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/resources/simple.json
index c97730030..8f7182887 100644
--- a/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/resources/simple.json
+++ b/springwolf-add-ons/springwolf-kotlinx-serialization-model-converter/src/test/resources/simple.json
@@ -1,21 +1,4 @@
 {
-  "NestedClass" : {
-    "type" : "object",
-    "properties" : {
-      "color" : {
-        "type" : "string",
-        "enum" : [ "RED", "GREEN", "BLUE" ]
-      },
-      "id" : {
-        "type" : "integer",
-        "format" : "int32"
-      },
-      "name" : {
-        "type" : "string"
-      }
-    },
-    "required" : [ "color", "id", "name" ]
-  },
   "SampleEvent" : {
     "type" : "object",
     "properties" : {