diff --git a/MeetingAssistant.Tests/TaskbarIconTests.cs b/MeetingAssistant.Tests/TaskbarIconTests.cs
index acd8f08..68a67d0 100644
--- a/MeetingAssistant.Tests/TaskbarIconTests.cs
+++ b/MeetingAssistant.Tests/TaskbarIconTests.cs
@@ -157,7 +157,7 @@ public sealed class TaskbarIconTests
         }
 
         Assert.True(right >= left && bottom >= top, "Expected the icon to contain a visible white glyph.");
-        return Rectangle.FromLTRB(left, top, right, bottom);
+        return Rectangle.FromLTRB(left, top, right + 1, bottom + 1);
     }
 
     private static double GetCenter(int start, int end)