diff --git a/src/model.rs b/src/model.rs
index 9d556cf..becee03 100644
--- a/src/model.rs
+++ b/src/model.rs
@@ -22,7 +22,7 @@ pub struct Cli {
     pub size: Option<Size>,
 }
 
-#[derive(Debug, Copy, Clone, Parser)]
+#[derive(Debug, Copy, Clone, Parser, Default)]
 pub struct Size {
     pub x: usize,
     pub y: usize,
@@ -66,12 +66,6 @@ impl From<Size> for SIZE {
     }
 }
 
-impl Default for Size {
-    fn default() -> Self {
-        Self { x: 0, y: 0 }
-    }
-}
-
 impl Display for Size {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}x{}", self.x, self.y)