Index: src/Common/NetTopologySuite/Operation/Overlay/PolygonBuilder.cs
===================================================================
diff -u -r5fc71a385897af92ccb092f2f969b5709afab85a -r631af07ec7055b19b558173a2a80b991a10b363f
--- src/Common/NetTopologySuite/Operation/Overlay/PolygonBuilder.cs	(.../PolygonBuilder.cs)	(revision 5fc71a385897af92ccb092f2f969b5709afab85a)
+++ src/Common/NetTopologySuite/Operation/Overlay/PolygonBuilder.cs	(.../PolygonBuilder.cs)	(revision 631af07ec7055b19b558173a2a80b991a10b363f)
@@ -284,11 +284,7 @@
                 {
                     minEnv = minShell.LinearRing.EnvelopeInternal;
                 }
-                bool isContained = false;
-                if (tryEnv.Contains(testEnv) && CGAlgorithms.IsPointInRing(testPt, tryRing.Coordinates))
-                {
-                    isContained = true;
-                }
+                bool isContained = tryEnv.Contains(testEnv) && CGAlgorithms.IsPointInRing(testPt, tryRing.Coordinates);
                 // check if this new containing ring is smaller than the current minimum ring
                 if (isContained)
                 {