diff --git a/CSharp/Clipper2Lib/Clipper.cs b/CSharp/Clipper2Lib/Clipper.cs
index 2fe3f820..57624041 100644
--- a/CSharp/Clipper2Lib/Clipper.cs
+++ b/CSharp/Clipper2Lib/Clipper.cs
@@ -30,7 +30,7 @@ public static class Clipper
       long.MaxValue, long.MaxValue, long.MinValue, long.MinValue);
 
     private static RectD maxInvalidRectD = new RectD(
-      double.MaxValue, -double.MaxValue, -double.MaxValue, -double.MaxValue);
+      double.MaxValue, double.MaxValue, -double.MaxValue, -double.MaxValue);
 
     public static Rect64 MaxInvalidRect64 => maxInvalidRect64;
     public static RectD MaxInvalidRectD => maxInvalidRectD;
@@ -792,4 +792,4 @@ public static PathD Ellipse(PointD center,
     }
 
   } // Clipper
-} // namespace
\ No newline at end of file
+} // namespace