diff --git a/example/main.go b/example/main.go
index b88ac018..47f094c3 100644
--- a/example/main.go
+++ b/example/main.go
@@ -48,6 +48,7 @@ func onReady() {
 		subMenuTop := systray.AddMenuItem("SubMenuTop", "SubMenu Test (top)")
 		subMenuMiddle := subMenuTop.AddSubMenuItem("SubMenuMiddle", "SubMenu Test (middle)")
 		subMenuBottom := subMenuMiddle.AddSubMenuItemCheckbox("SubMenuBottom - Toggle Panic!", "SubMenu Test (bottom) - Hide/Show Panic!", false)
+		subMenuMiddle.AddSeparator()
 		subMenuBottom2 := subMenuMiddle.AddSubMenuItem("SubMenuBottom - Panic!", "SubMenu Test (bottom)")
 
 		mUrl := systray.AddMenuItem("Open UI", "my home")
diff --git a/systray.go b/systray.go
index cd5ae283..827bb9d3 100644
--- a/systray.go
+++ b/systray.go
@@ -133,7 +133,12 @@ func AddMenuItemCheckbox(title string, tooltip string, checked bool) *MenuItem {
 
 // AddSeparator adds a separator bar to the menu
 func AddSeparator() {
-	addSeparator(atomic.AddUint32(&currentID, 1))
+	addSeparator(0)
+}
+
+// AddSeparator adds a separator bar to the submenu
+func (item *MenuItem) AddSeparator() {
+	addSeparator(item.id)
 }
 
 // AddSubMenuItem adds a nested sub-menu item with the designated title and tooltip.
diff --git a/systray_darwin.m b/systray_darwin.m
index ecf21ace..5e7e2cc2 100644
--- a/systray_darwin.m
+++ b/systray_darwin.m
@@ -187,7 +187,17 @@ - (void)add_or_update_menu_item:(MenuItem *)item {
 
 - (void) add_separator:(NSNumber*) menuId
 {
-  [menu addItem: [NSMenuItem separatorItem]];
+  if ([menuId intValue] == 0) {
+    [menu addItem: [NSMenuItem separatorItem]];
+    return;
+  }
+
+  NSMenuItem* menuItem = find_menu_item(menu, menuId);
+  if (menuItem != NULL) {
+    if (menuItem.hasSubmenu) {
+      [menuItem.submenu addItem: [NSMenuItem separatorItem]];
+    }
+  }
 }
 
 - (void) hide_menu_item:(NSNumber*) menuId
diff --git a/systray_linux.c b/systray_linux.c
index 9e14ba01..ffb6ca9a 100644
--- a/systray_linux.c
+++ b/systray_linux.c
@@ -179,8 +179,16 @@ gboolean do_add_or_update_menu_item(gpointer data) {
 }
 
 gboolean do_add_separator(gpointer data) {
+	MenuItemInfo *mii = (MenuItemInfo*)data;
+	GtkMenuItem* menuItem = find_menu_by_id(mii->menu_id);
+	GtkWidget* menu = gtk_menu_item_get_submenu(menuItem);
+
+	if(menu == NULL) {
+		menu = global_tray_menu;
+	}
+
 	GtkWidget *separator = gtk_separator_menu_item_new();
-	gtk_menu_shell_append(GTK_MENU_SHELL(global_tray_menu), separator);
+	gtk_menu_shell_append(GTK_MENU_SHELL(menu), separator);
 	gtk_widget_show(separator);
 	return FALSE;
 }
diff --git a/systray_nonwindows.go b/systray_nonwindows.go
index 12eacdfa..e67489e4 100644
--- a/systray_nonwindows.go
+++ b/systray_nonwindows.go
@@ -1,5 +1,5 @@
+//go:build !windows
 // +build !windows
-// go:build !windows
 
 package systray
 
@@ -69,8 +69,8 @@ func addOrUpdateMenuItem(item *MenuItem) {
 	)
 }
 
-func addSeparator(id uint32) {
-	C.add_separator(C.int(id))
+func addSeparator(menuID uint32) {
+	C.add_separator(C.int(menuID))
 }
 
 func hideMenuItem(item *MenuItem) {
diff --git a/systray_windows.go b/systray_windows.go
index 13b4411d..e84a8544 100644
--- a/systray_windows.go
+++ b/systray_windows.go
@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 package systray
@@ -10,6 +11,7 @@ import (
 	"path/filepath"
 	"sort"
 	"sync"
+	"sync/atomic"
 	"syscall"
 	"unsafe"
 
@@ -581,7 +583,7 @@ func (t *winTray) addOrUpdateMenuItem(menuItemId uint32, parentId uint32, title
 	return nil
 }
 
-func (t *winTray) addSeparatorMenuItem(menuItemId, parentId uint32) error {
+func (t *winTray) addSeparatorMenuItem(menuID uint32) error {
 	// https://msdn.microsoft.com/en-us/library/windows/desktop/ms647578(v=vs.85).aspx
 	const (
 		MIIM_FTYPE = 0x00000100
@@ -593,15 +595,15 @@ func (t *winTray) addSeparatorMenuItem(menuItemId, parentId uint32) error {
 	mi := menuItemInfo{
 		Mask: MIIM_FTYPE | MIIM_ID | MIIM_STATE,
 		Type: MFT_SEPARATOR,
-		ID:   uint32(menuItemId),
+		ID:   atomic.AddUint32(&currentID, 1),
 	}
 
 	mi.Size = uint32(unsafe.Sizeof(mi))
 
-	t.addToVisibleItems(parentId, menuItemId)
-	position := t.getVisibleItemIndex(parentId, menuItemId)
+	t.addToVisibleItems(menuID, mi.ID)
+	position := t.getVisibleItemIndex(menuID, mi.ID)
 	t.muMenus.RLock()
-	menu := uintptr(t.menus[parentId])
+	menu := uintptr(t.menus[menuID])
 	t.muMenus.RUnlock()
 	res, _, err := pInsertMenuItem.Call(
 		menu,
@@ -928,8 +930,8 @@ func (item *MenuItem) SetTemplateIcon(templateIconBytes []byte, regularIconBytes
 	item.SetIcon(regularIconBytes)
 }
 
-func addSeparator(id uint32) {
-	err := wt.addSeparatorMenuItem(id, 0)
+func addSeparator(menuID uint32) {
+	err := wt.addSeparatorMenuItem(menuID)
 	if err != nil {
 		log.Errorf("Unable to addSeparator: %v", err)
 		return