diff --git a/src/polygon.cpp b/src/polygon.cpp
index 33f9b01..4adee80 100644
--- a/src/polygon.cpp
+++ b/src/polygon.cpp
@@ -700,11 +700,11 @@ bool SPolygon::ContainsPoint(Vector p) const {
     return (WindingNumberForPoint(p) % 2) == 1;
 }
 
-int SPolygon::WindingNumberForPoint(Vector p) const {
+size_t SPolygon::WindingNumberForPoint(Vector p) const {
     auto winding = std::count_if(l.begin(), l.end(), [&](const SContour &sc) {
         return sc.ContainsPointProjdToNormal(normal, p);
     });
-    return static_cast<int>(winding);
+    return winding;
 }
 
 void SPolygon::FixContourDirections() {
diff --git a/src/polygon.h b/src/polygon.h
index a9a754c..29cc0aa 100644
--- a/src/polygon.h
+++ b/src/polygon.h
@@ -149,7 +149,7 @@ public:
 
     Vector ComputeNormal() const;
     void AddEmptyContour();
-    int WindingNumberForPoint(Vector p) const;
+    size_t WindingNumberForPoint(Vector p) const;
     double SignedArea() const;
     bool ContainsPoint(Vector p) const;
     void MakeEdgesInto(SEdgeList *el) const;