diff --git a/demos/clipboard.c b/demos/clipboard.c
index 9321f0b..7d5a172 100644
--- a/demos/clipboard.c
+++ b/demos/clipboard.c
@@ -6,6 +6,10 @@ struct demo {
 	struct gral_window *window;
 };
 
+static void destroy(void *user_data) {
+
+}
+
 static int close(void *user_data) {
 	return 1;
 }
@@ -81,6 +85,7 @@ static void focus_leave(void *user_data) {
 static void create_window(void *user_data) {
 	struct demo *demo = user_data;
 	struct gral_window_interface interface = {
+		&destroy,
 		&close,
 		&draw,
 		&resize,
@@ -122,7 +127,6 @@ int main(int argc, char **argv) {
 	struct gral_application_interface interface = {&start, &open_empty, &open_file, &quit};
 	demo.application = gral_application_create("com.github.eyelash.libgral.demos.clipboard", &interface, &demo);
 	int result = gral_application_run(demo.application, argc, argv);
-	gral_window_delete(demo.window);
 	gral_application_delete(demo.application);
 	return result;
 }
diff --git a/demos/cursors.c b/demos/cursors.c
index dd1d302..0ca0b19 100644
--- a/demos/cursors.c
+++ b/demos/cursors.c
@@ -7,6 +7,10 @@ struct demo {
 	int cursor;
 };
 
+static void destroy(void *user_data) {
+
+}
+
 static int close(void *user_data) {
 	return 1;
 }
@@ -107,6 +111,7 @@ static void focus_leave(void *user_data) {
 static void create_window(void *user_data) {
 	struct demo *demo = user_data;
 	struct gral_window_interface interface = {
+		&destroy,
 		&close,
 		&draw,
 		&resize,
@@ -149,7 +154,6 @@ int main(int argc, char **argv) {
 	struct gral_application_interface interface = {&start, &open_empty, &open_file, &quit};
 	demo.application = gral_application_create("com.github.eyelash.libgral.demos.cursors", &interface, &demo);
 	int result = gral_application_run(demo.application, argc, argv);
-	gral_window_delete(demo.window);
 	gral_application_delete(demo.application);
 	return result;
 }
diff --git a/demos/draw.c b/demos/draw.c
index 4caa7d7..c6fcac6 100644
--- a/demos/draw.c
+++ b/demos/draw.c
@@ -9,6 +9,10 @@ struct demo {
 	struct gral_window *window;
 };
 
+static void destroy(void *user_data) {
+
+}
+
 static int close(void *user_data) {
 	return 1;
 }
@@ -149,6 +153,7 @@ static void focus_leave(void *user_data) {
 static void create_window(void *user_data) {
 	struct demo *demo = user_data;
 	struct gral_window_interface interface = {
+		&destroy,
 		&close,
 		&draw,
 		&resize,
@@ -191,7 +196,6 @@ int main(int argc, char **argv) {
 	struct gral_application_interface interface = {&start, &open_empty, &open_file, &quit};
 	demo.application = gral_application_create("com.github.eyelash.libgral.demos.draw", &interface, &demo);
 	int result = gral_application_run(demo.application, argc, argv);
-	gral_window_delete(demo.window);
 	gral_application_delete(demo.application);
 	return result;
 }
diff --git a/demos/events.c b/demos/events.c
index b48e4ad..7000605 100644
--- a/demos/events.c
+++ b/demos/events.c
@@ -9,6 +9,10 @@ struct demo {
 	struct gral_midi *midi;
 };
 
+static void destroy(void *user_data) {
+	printf("destroy\n");
+}
+
 static int close(void *user_data) {
 	printf("close\n");
 	return 1;
@@ -122,6 +126,7 @@ static void control_change(unsigned char controller, unsigned char value, void *
 static void create_window(void *user_data) {
 	struct demo *demo = user_data;
 	struct gral_window_interface interface = {
+		&destroy,
 		&close,
 		&draw,
 		&resize,
@@ -171,7 +176,6 @@ int main(int argc, char **argv) {
 	struct gral_application_interface interface = {&start, &open_empty, &open_file, &quit};
 	demo.application = gral_application_create("com.github.eyelash.libgral.demos.events", &interface, &demo);
 	int result = gral_application_run(demo.application, argc, argv);
-	gral_window_delete(demo.window);
 	gral_application_delete(demo.application);
 	return result;
 }
diff --git a/demos/file_dialogs.c b/demos/file_dialogs.c
index bc7ee5a..6c83050 100644
--- a/demos/file_dialogs.c
+++ b/demos/file_dialogs.c
@@ -7,6 +7,10 @@ struct demo {
 	struct gral_window *window;
 };
 
+static void destroy(void *user_data) {
+
+}
+
 static int close(void *user_data) {
 	return 1;
 }
@@ -91,6 +95,7 @@ static void focus_leave(void *user_data) {
 static void create_window(void *user_data) {
 	struct demo *demo = user_data;
 	struct gral_window_interface interface = {
+		&destroy,
 		&close,
 		&draw,
 		&resize,
@@ -133,7 +138,6 @@ int main(int argc, char **argv) {
 	struct gral_application_interface interface = {&start, &open_empty, &open_file, &quit};
 	demo.application = gral_application_create("com.github.eyelash.libgral.demos.file_dialogs", &interface, &demo);
 	int result = gral_application_run(demo.application, argc, argv);
-	gral_window_delete(demo.window);
 	gral_application_delete(demo.application);
 	return result;
 }
diff --git a/demos/text.c b/demos/text.c
index 0cab9f9..0315cae 100644
--- a/demos/text.c
+++ b/demos/text.c
@@ -9,6 +9,10 @@ struct demo {
 	float descent;
 };
 
+static void destroy(void *user_data) {
+
+}
+
 static int close(void *user_data) {
 	return 1;
 }
@@ -96,6 +100,7 @@ static void focus_leave(void *user_data) {
 static void create_window(void *user_data) {
 	struct demo *demo = user_data;
 	struct gral_window_interface interface = {
+		&destroy,
 		&close,
 		&draw,
 		&resize,
@@ -146,7 +151,6 @@ int main(int argc, char **argv) {
 	demo.application = gral_application_create("com.github.eyelash.libgral.demos.text", &interface, &demo);
 	int result = gral_application_run(demo.application, argc, argv);
 	gral_text_delete(demo.text);
-	gral_window_delete(demo.window);
 	gral_application_delete(demo.application);
 	return result;
 }
diff --git a/gral.h b/gral.h
index a58dd67..a33c73c 100644
--- a/gral.h
+++ b/gral.h
@@ -78,6 +78,7 @@ struct gral_gradient_stop {
 struct gral_draw_context;
 struct gral_window;
 struct gral_window_interface {
+	void (*destroy)(void *user_data);
 	int (*close)(void *user_data);
 	void (*draw)(struct gral_draw_context *draw_context, int x, int y, int width, int height, void *user_data);
 	void (*resize)(int width, int height, void *user_data);
@@ -154,7 +155,6 @@ void gral_draw_context_draw_transformed(struct gral_draw_context *draw_context,
  ===========*/
 
 struct gral_window *gral_window_create(struct gral_application *application, int width, int height, char const *title, struct gral_window_interface const *interface, void *user_data);
-void gral_window_delete(struct gral_window *window);
 void gral_window_set_title(struct gral_window *window, char const *title);
 void gral_window_request_redraw(struct gral_window *window, int x, int y, int width, int height);
 void gral_window_set_minimum_size(struct gral_window *window, int minimum_width, int minimum_height);
diff --git a/gral_linux.c b/gral_linux.c
index 2f721b4..db02139 100644
--- a/gral_linux.c
+++ b/gral_linux.c
@@ -307,12 +307,19 @@ static gboolean gral_window_delete_event(GtkWidget *widget, GdkEventAny *event)
 	GralWindow *window = GRAL_WINDOW(widget);
 	return !window->interface.close(window->user_data);
 }
+static void gral_window_finalize(GObject *object) {
+	GralWindow *window = GRAL_WINDOW(object);
+	window->interface.destroy(window->user_data);
+	G_OBJECT_CLASS(gral_window_parent_class)->finalize(object);
+}
 static void gral_window_init(GralWindow *window) {
 
 }
 static void gral_window_class_init(GralWindowClass *class) {
 	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(class);
 	widget_class->delete_event = gral_window_delete_event;
+	GObjectClass *object_class = G_OBJECT_CLASS(class);
+	object_class->finalize = gral_window_finalize;
 }
 
 #define GRAL_TYPE_AREA gral_area_get_type()
@@ -496,7 +503,6 @@ static void gral_area_class_init(GralAreaClass *class) {
 
 struct gral_window *gral_window_create(struct gral_application *application, int width, int height, char const *title, struct gral_window_interface const *interface, void *user_data) {
 	GralWindow *window = g_object_new(GRAL_TYPE_WINDOW, "application", application, NULL);
-	g_object_ref_sink(window);
 	window->interface = *interface;
 	window->user_data = user_data;
 	window->is_cursor_hidden = FALSE;
@@ -510,10 +516,6 @@ struct gral_window *gral_window_create(struct gral_application *application, int
 	return (struct gral_window *)window;
 }
 
-void gral_window_delete(struct gral_window *window) {
-	g_object_unref(window);
-}
-
 void gral_window_set_title(struct gral_window *window, char const *title) {
 	gtk_window_set_title(GTK_WINDOW(window), title);
 }
diff --git a/gral_macos.m b/gral_macos.m
index d199864..fe4e0db 100644
--- a/gral_macos.m
+++ b/gral_macos.m
@@ -411,6 +411,10 @@ - (void)windowDidBecomeKey:(NSNotification *)notification {
 - (void)windowDidResignKey:(NSNotification *)notification {
 	interface.focus_leave(user_data);
 }
+- (void)dealloc {
+	interface.destroy(user_data);
+	[super dealloc];
+}
 @end
 
 @interface GralView: NSView<NSTextInputClient> {
@@ -583,10 +587,6 @@ - (void)doCommandBySelector:(SEL)selector {
 	return (struct gral_window *)window;
 }
 
-void gral_window_delete(struct gral_window *window) {
-	[(GralWindow *)window release];
-}
-
 void gral_window_set_title(struct gral_window *window, char const *title) {
 	[(GralWindow *)window setTitle:[NSString stringWithUTF8String:title]];
 }
diff --git a/gral_windows.cpp b/gral_windows.cpp
index d8fcc77..3ba1b9c 100644
--- a/gral_windows.cpp
+++ b/gral_windows.cpp
@@ -487,6 +487,7 @@ static LRESULT CALLBACK window_procedure(HWND hwnd, UINT uMsg, WPARAM wParam, LP
 		}
 	case WM_DESTROY:
 		{
+			window_data->iface.destroy(window_data->user_data);
 			if (window_data->target) {
 				window_data->target->Release();
 			}
@@ -930,10 +931,6 @@ gral_window *gral_window_create(gral_application *application, int width, int he
 	return (gral_window *)hwnd;
 }
 
-void gral_window_delete(gral_window *window) {
-
-}
-
 void gral_window_set_title(gral_window *window, char const *title) {
 	SetWindowText((HWND)window, utf8_to_utf16(title));
 }