diff --git a/src/aare/gui/panels/monochromator_panel.py b/src/aare/gui/panels/monochromator_panel.py
index 6b3dcee7..9b2a3815 100644
--- a/src/aare/gui/panels/monochromator_panel.py
+++ b/src/aare/gui/panels/monochromator_panel.py
@@ -87,9 +87,13 @@ class MonochromatorPanel(QWidget):
         if self._shutter_open is None:
             text = "Fast Shutter: —"
         elif self._shutter_open:
-            text = f"""Fast Shutter: <span style="color: {self._colors["alert"]} ; "> Open ☢️ </span>"""
+            text = (
+                f"""Fast Shutter: <span style="color: {self._colors["alert"]} ; "> Open ☢️ </span>"""
+            )
         else:
-            text = f"""Fast Shutter: <span style="color: {self._colors["ok"]} ; "> Closed 🚪 </span>"""
+            text = (
+                f"""Fast Shutter: <span style="color: {self._colors["ok"]} ; "> Closed 🚪 </span>"""
+            )
         if self.shutter_status_label.text() != text:
             self.shutter_status_label.setText(text)