diff --git a/scene/resources/mesh.cpp b/scene/resources/mesh.cpp
index a063b7f74fb7..1caeddd88168 100644
--- a/scene/resources/mesh.cpp
+++ b/scene/resources/mesh.cpp
@@ -252,10 +252,12 @@ Ref<Shape> Mesh::create_trimesh_shape() const {
 	Vector<Vector3> face_points;
 	face_points.resize(faces.size() * 3);
 
-	for (int i = 0; i < face_points.size(); i++) {
+	for (int i = 0; i < face_points.size(); i += 3) {
 
 		Face3 f = faces.get(i / 3);
-		face_points.set(i, f.vertex[i % 3]);
+		face_points.set(i, f.vertex[0]);
+		face_points.set(i + 1, f.vertex[1]);
+		face_points.set(i + 2, f.vertex[2]);
 	}
 
 	Ref<ConcavePolygonShape> shape = memnew(ConcavePolygonShape);