diff --git a/novelwriter/gui/outline.py b/novelwriter/gui/outline.py
index dc0bf6d6..b5a1060a 100644
--- a/novelwriter/gui/outline.py
+++ b/novelwriter/gui/outline.py
@@ -254,6 +254,8 @@ class GuiOutlineToolBar(QToolBar):
         self.addWidget(self.tbColumns)
         self.addWidget(stretch)
 
+        self.updateTheme()
+
         logger.debug("GuiOutlineToolBar initialisation complete")
 
         return