diff --git a/sources/ClangSharp.PInvokeGenerator/CSharp/CSharpOutputBuilder.VisitDecl.cs b/sources/ClangSharp.PInvokeGenerator/CSharp/CSharpOutputBuilder.VisitDecl.cs
index 5060f29d..fc214b61 100644
--- a/sources/ClangSharp.PInvokeGenerator/CSharp/CSharpOutputBuilder.VisitDecl.cs
+++ b/sources/ClangSharp.PInvokeGenerator/CSharp/CSharpOutputBuilder.VisitDecl.cs
@@ -826,7 +826,7 @@ public void BeginStruct(in StructDesc desc)
 
     public void BeginMarkerInterface(string[]? baseTypeNames)
     {
-        WriteIndented("public interface Interface");
+        WriteIndented("public partial interface Interface");
 
         if (baseTypeNames is not null)
         {
diff --git a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpCompatibleUnix/CXXMethodDeclarationTest.cs b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpCompatibleUnix/CXXMethodDeclarationTest.cs
index 5a363544..22fb1ccb 100644
--- a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpCompatibleUnix/CXXMethodDeclarationTest.cs
+++ b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpCompatibleUnix/CXXMethodDeclarationTest.cs
@@ -633,7 +633,7 @@ public int GetType(int objA, int objB)
             }}
         }}
 
-        public interface Interface
+        public partial interface Interface
         {{
             int GetType(int obj);
 
diff --git a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpCompatibleWindows/CXXMethodDeclarationTest.cs b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpCompatibleWindows/CXXMethodDeclarationTest.cs
index 88bd0b5e..089347c5 100644
--- a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpCompatibleWindows/CXXMethodDeclarationTest.cs
+++ b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpCompatibleWindows/CXXMethodDeclarationTest.cs
@@ -628,7 +628,7 @@ public int GetType(int obj)
             }}
         }}
 
-        public interface Interface
+        public partial interface Interface
         {{
             int GetType(int objA, int objB);
 
diff --git a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpDefaultUnix/CXXMethodDeclarationTest.cs b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpDefaultUnix/CXXMethodDeclarationTest.cs
index 9049cd5d..f2d3692c 100644
--- a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpDefaultUnix/CXXMethodDeclarationTest.cs
+++ b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpDefaultUnix/CXXMethodDeclarationTest.cs
@@ -571,7 +571,7 @@ public int GetType(int objA, int objB)
             return lpVtbl->GetType2((MyStruct*)Unsafe.AsPointer(ref this), objA, objB);
         }}
 
-        public interface Interface
+        public partial interface Interface
         {{
             int GetType(int obj);
 
diff --git a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpDefaultWindows/CXXMethodDeclarationTest.cs b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpDefaultWindows/CXXMethodDeclarationTest.cs
index a668f2c1..9158c581 100644
--- a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpDefaultWindows/CXXMethodDeclarationTest.cs
+++ b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpDefaultWindows/CXXMethodDeclarationTest.cs
@@ -576,7 +576,7 @@ public int GetType(int obj)
             return lpVtbl->GetType2((MyStruct*)Unsafe.AsPointer(ref this), obj);
         }}
 
-        public interface Interface
+        public partial interface Interface
         {{
             int GetType(int objA, int objB);
 
diff --git a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpLatestUnix/CXXMethodDeclarationTest.cs b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpLatestUnix/CXXMethodDeclarationTest.cs
index 6d422c23..dbba2f3a 100644
--- a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpLatestUnix/CXXMethodDeclarationTest.cs
+++ b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpLatestUnix/CXXMethodDeclarationTest.cs
@@ -571,7 +571,7 @@ public int GetType(int objA, int objB)
             return lpVtbl->GetType2((MyStruct*)Unsafe.AsPointer(ref this), objA, objB);
         }}
 
-        public interface Interface
+        public partial interface Interface
         {{
             int GetType(int obj);
 
diff --git a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpLatestWindows/CXXMethodDeclarationTest.cs b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpLatestWindows/CXXMethodDeclarationTest.cs
index 731613c9..f9e04214 100644
--- a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpLatestWindows/CXXMethodDeclarationTest.cs
+++ b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpLatestWindows/CXXMethodDeclarationTest.cs
@@ -571,7 +571,7 @@ public int GetType(int obj)
             return lpVtbl->GetType2((MyStruct*)Unsafe.AsPointer(ref this), obj);
         }}
 
-        public interface Interface
+        public partial interface Interface
         {{
             int GetType(int objA, int objB);
 
diff --git a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpPreviewUnix/CXXMethodDeclarationTest.cs b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpPreviewUnix/CXXMethodDeclarationTest.cs
index d0e056f3..18e9f345 100644
--- a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpPreviewUnix/CXXMethodDeclarationTest.cs
+++ b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpPreviewUnix/CXXMethodDeclarationTest.cs
@@ -571,7 +571,7 @@ public int GetType(int objA, int objB)
             return lpVtbl->GetType2((MyStruct*)Unsafe.AsPointer(ref this), objA, objB);
         }}
 
-        public interface Interface
+        public partial interface Interface
         {{
             int GetType(int obj);
 
diff --git a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpPreviewWindows/CXXMethodDeclarationTest.cs b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpPreviewWindows/CXXMethodDeclarationTest.cs
index a49a18d3..3b98b60e 100644
--- a/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpPreviewWindows/CXXMethodDeclarationTest.cs
+++ b/tests/ClangSharp.PInvokeGenerator.UnitTests/CSharpPreviewWindows/CXXMethodDeclarationTest.cs
@@ -571,7 +571,7 @@ public int GetType(int obj)
             return lpVtbl->GetType2((MyStruct*)Unsafe.AsPointer(ref this), obj);
         }}
 
-        public interface Interface
+        public partial interface Interface
         {{
             int GetType(int objA, int objB);