diff --git a/docs/diagrams/ChangeThemeSequenceDiagram.puml b/docs/diagrams/ChangeThemeSequenceDiagram.puml
index 194190aea57..eb026fe19e1 100644
--- a/docs/diagrams/ChangeThemeSequenceDiagram.puml
+++ b/docs/diagrams/ChangeThemeSequenceDiagram.puml
@@ -2,7 +2,7 @@
 !include style.puml
 skinparam ArrowFontStyle plain
 box Ui UI_COLOR_T1
-participant ":Ui" as Ui UI_COLOR
+participant ":MainWindow" as Ui UI_COLOR
 end box
 
 box Logic LOGIC_COLOR_T1