diff --git a/src/backends/x11/nested/meta-backend-x11-nested.c b/src/backends/x11/nested/meta-backend-x11-nested.c
index 022599449..7930e3f2a 100644
--- a/src/backends/x11/nested/meta-backend-x11-nested.c
+++ b/src/backends/x11/nested/meta-backend-x11-nested.c
@@ -27,11 +27,6 @@
 
 #include "wayland/meta-wayland.h"
 
-struct _MetaBackendX11Nested
-{
-  MetaBackendX11 parent;
-};
-
 G_DEFINE_TYPE (MetaBackendX11Nested, meta_backend_x11_nested,
                META_TYPE_BACKEND_X11)
 
diff --git a/src/backends/x11/nested/meta-backend-x11-nested.h b/src/backends/x11/nested/meta-backend-x11-nested.h
index 31ae96fa4..6f2c26576 100644
--- a/src/backends/x11/nested/meta-backend-x11-nested.h
+++ b/src/backends/x11/nested/meta-backend-x11-nested.h
@@ -25,7 +25,12 @@
 #include "backends/x11/meta-backend-x11.h"
 
 #define META_TYPE_BACKEND_X11_NESTED (meta_backend_x11_nested_get_type ())
-G_DECLARE_FINAL_TYPE (MetaBackendX11Nested, meta_backend_x11_nested,
-                      META, BACKEND_X11_NESTED, MetaBackendX11)
+G_DECLARE_DERIVABLE_TYPE (MetaBackendX11Nested, meta_backend_x11_nested,
+                          META, BACKEND_X11_NESTED, MetaBackendX11)
+
+struct _MetaBackendX11NestedClass
+{
+  MetaBackendX11Class parent_class;
+};
 
 #endif /* META_BACKEND_X11_NESTED_H */
diff --git a/src/tests/meta-backend-test.c b/src/tests/meta-backend-test.c
index e516c8665..4abe0b739 100644
--- a/src/tests/meta-backend-test.c
+++ b/src/tests/meta-backend-test.c
@@ -25,10 +25,10 @@
 
 struct _MetaBackendTest
 {
-  MetaBackendX11 parent;
+  MetaBackendX11Nested parent;
 };
 
-G_DEFINE_TYPE (MetaBackendTest, meta_backend_test, META_TYPE_BACKEND_X11)
+G_DEFINE_TYPE (MetaBackendTest, meta_backend_test, META_TYPE_BACKEND_X11_NESTED)
 
 static void
 meta_backend_test_init (MetaBackendTest *backend_test)
diff --git a/src/tests/meta-backend-test.h b/src/tests/meta-backend-test.h
index e6662125f..4ac04e0f4 100644
--- a/src/tests/meta-backend-test.h
+++ b/src/tests/meta-backend-test.h
@@ -20,10 +20,10 @@
 #ifndef META_BACKEND_TEST_H
 #define META_BACKEND_TEST_H
 
-#include "backends/x11/meta-backend-x11.h"
+#include "backends/x11/nested/meta-backend-x11-nested.h"
 
 #define META_TYPE_BACKEND_TEST (meta_backend_test_get_type ())
 G_DECLARE_FINAL_TYPE (MetaBackendTest, meta_backend_test,
-                      META, BACKEND_TEST, MetaBackendX11)
+                      META, BACKEND_TEST, MetaBackendX11Nested)
 
 #endif /* META_BACKEND_TEST_H */