diff --git a/ricaun.Revit.UI.Example/Revit/AppTheme.cs b/ricaun.Revit.UI.Example/Revit/AppTheme.cs
index 4c6d253..e1aeb80 100644
--- a/ricaun.Revit.UI.Example/Revit/AppTheme.cs
+++ b/ricaun.Revit.UI.Example/Revit/AppTheme.cs
@@ -33,7 +33,7 @@ public Result OnStartup(UIControlledApplication application)
             ribbonPanel.CreatePushButton<CommandTheme>("Light")
                 .SetLargeImage(LIGHT);
             ribbonPanel.CreatePushButton<CommandTheme>("Dark")
-                .SetLargeImage(LIGHT);
+                .SetLargeImage(DARK);
 
             ribbonPanel.CreatePushButton<CommandTheme>(".")
                 .SetLargeImage(LIGHT_GREEN)