diff --git a/agui2/src/Graphics/InputGraphicsBox.cpp b/agui2/src/Graphics/InputGraphicsBox.cpp
index 5bd346d58ea1334667c7025cf53a3477a0b003b7..aa43abb8570230632bbde28e47a17b64aacfb0d1 100644
--- a/agui2/src/Graphics/InputGraphicsBox.cpp
+++ b/agui2/src/Graphics/InputGraphicsBox.cpp
@@ -31,6 +31,7 @@ void InputGraphicsBox::on_SetInput()
     }
 
     this->color = model->getAutomaton() ? Qt::blue : Qt::red;
+    this->update();
 }
 
 void InputGraphicsBox::contextMenuEvent(QGraphicsSceneContextMenuEvent* event) {