diff --git a/src/libslic3r/Polygon.cpp b/src/libslic3r/Polygon.cpp
index e744272ac0..66aa224ed7 100644
--- a/src/libslic3r/Polygon.cpp
+++ b/src/libslic3r/Polygon.cpp
@@ -33,32 +33,16 @@ Polyline Polygon::split_at_index(int index) const
     return polyline;
 }
 
-/*
-int64_t Polygon::area2x() const
-{
-    size_t n = poly.size();
-    if (n < 3) 
-        return 0;
-
-    int64_t a = 0;
-    for (size_t i = 0, j = n - 1; i < n; ++i)
-        a += int64_t(poly[j](0) + poly[i](0)) * int64_t(poly[j](1) - poly[i](1));
-        j = i;
-    }
-    return -a * 0.5;
-}
-*/
-
 double Polygon::area(const Points &points)
 {
-    size_t n = points.size();
-    if (n < 3) 
-        return 0.;
-    
     double a = 0.;
-    for (size_t i = 0, j = n - 1; i < n; ++i) {
-        a += ((double)points[j](0) + (double)points[i](0)) * ((double)points[i](1) - (double)points[j](1));
-        j = i;
+    if (points.size() >= 3) {
+        Vec2d p1 = points.back().cast<double>();
+        for (const Point &p : points) {
+            Vec2d p2 = p.cast<double>();
+            a += cross2(p1, p2);
+            p1 = p2;
+        }
     }
     return 0.5 * a;
 }