diff --git a/test/Riok.Mapperly.IntegrationTests/Mapper/StaticTestMapper.cs b/test/Riok.Mapperly.IntegrationTests/Mapper/StaticTestMapper.cs
index a5623620ac..155cccf91c 100644
--- a/test/Riok.Mapperly.IntegrationTests/Mapper/StaticTestMapper.cs
+++ b/test/Riok.Mapperly.IntegrationTests/Mapper/StaticTestMapper.cs
@@ -91,6 +91,15 @@ public static void MapExistingList(List<string> src, List<int> dst)
 
         public static partial TTarget MapGeneric<TSource, TTarget>(TSource source);
 
+#if NET7_0_OR_GREATER
+        [MapDerivedType<ExistingObjectTypeA, ExistingObjectTypeA>]
+        [MapDerivedType<ExistingObjectTypeB, ExistingObjectTypeB>]
+#else
+        [MapDerivedType(typeof(ExistingObjectTypeA), typeof(ExistingObjectTypeADto))]
+        [MapDerivedType(typeof(ExistingObjectTypeB), typeof(ExistingObjectTypeBDto))]
+#endif
+        public static partial void MapToDerivedExisting(ExistingObjectBase source, ExistingObjectBase target);
+
         [MapEnum(EnumMappingStrategy.ByName)]
         public static partial TestEnumDtoByName MapToEnumDtoByName(TestEnum v);
 
diff --git a/test/Riok.Mapperly.IntegrationTests/Models/ExistingObjectBase.cs b/test/Riok.Mapperly.IntegrationTests/Models/ExistingObjectBase.cs
new file mode 100644
index 0000000000..ecf957bd8e
--- /dev/null
+++ b/test/Riok.Mapperly.IntegrationTests/Models/ExistingObjectBase.cs
@@ -0,0 +1,7 @@
+namespace Riok.Mapperly.IntegrationTests.Models
+{
+    public class ExistingObjectBase
+    {
+        public int Value { get; set; }
+    }
+}
diff --git a/test/Riok.Mapperly.IntegrationTests/Models/ExistingObjectTypeA.cs b/test/Riok.Mapperly.IntegrationTests/Models/ExistingObjectTypeA.cs
new file mode 100644
index 0000000000..02acc4c585
--- /dev/null
+++ b/test/Riok.Mapperly.IntegrationTests/Models/ExistingObjectTypeA.cs
@@ -0,0 +1,7 @@
+namespace Riok.Mapperly.IntegrationTests.Models
+{
+    public class ExistingObjectTypeA : ExistingObjectBase
+    {
+        public int ValueA { get; set; }
+    }
+}
diff --git a/test/Riok.Mapperly.IntegrationTests/Models/ExistingObjectTypeB.cs b/test/Riok.Mapperly.IntegrationTests/Models/ExistingObjectTypeB.cs
new file mode 100644
index 0000000000..5c872b374d
--- /dev/null
+++ b/test/Riok.Mapperly.IntegrationTests/Models/ExistingObjectTypeB.cs
@@ -0,0 +1,7 @@
+namespace Riok.Mapperly.IntegrationTests.Models
+{
+    public class ExistingObjectTypeB : ExistingObjectBase
+    {
+        public int ValueB { get; set; }
+    }
+}