diff --git a/src/geometry.rs b/src/geometry.rs
index dcb193e..d1e7c5a 100644
--- a/src/geometry.rs
+++ b/src/geometry.rs
@@ -23,14 +23,12 @@ impl Point {
         Self { x: 0, y: 0 }
     }
 
-    pub fn with_x(&mut self, x: u32) -> &mut Self {
-        self.x = x;
-        self
+    pub fn with_x(&self, x: u32) -> Self {
+        Self { x, y: self.y }
     }
 
-    pub fn with_y(&mut self, y: u32) -> &mut Self {
-        self.y = y;
-        self
+    pub fn with_y(&self, y: u32) -> Self {
+        Self { x: self.x, y }
     }
 
     pub fn x(&self) -> u32 {
@@ -93,12 +91,12 @@ mod tests {
 
     #[test]
     fn test_point_set_x() {
-        assert_eq!(Point::new(42, 52).with_x(12), &Point::new(12, 52));
+        assert_eq!(Point::new(42, 52).with_x(12), Point::new(12, 52));
     }
 
     #[test]
     fn test_point_set_y() {
-        assert_eq!(Point::new(42, 52).with_y(12), &Point::new(42, 12));
+        assert_eq!(Point::new(42, 52).with_y(12), Point::new(42, 12));
     }
 
     #[test]