diff --git a/src/polygon.h b/src/polygon.h
index 29cc0aa..a4be64b 100644
--- a/src/polygon.h
+++ b/src/polygon.h
@@ -184,7 +184,6 @@ public:
     Vector Normal() const;
     void FlipNormal();
     double MinAltitude() const;
-    int WindingNumberForPoint(Vector p) const;
     bool ContainsPoint(Vector p) const;
     bool ContainsPointProjd(Vector n, Vector p) const;
     STriangle Transform(Vector o, Vector u, Vector v) const;