diff --git a/src/boundaries.rs b/src/boundaries.rs
index d4fedf5d..9399006e 100644
--- a/src/boundaries.rs
+++ b/src/boundaries.rs
@@ -160,7 +160,7 @@ impl Boundaries {
             boundary_characters: HashMap::new(),
         }
     }
-    pub fn add_rect(&mut self, rect: &dyn Rect) {
+    pub fn add_rect<R: Rect>(&mut self, rect: &R) {
         if self.rect_right_boundary_is_before_screen_edge(rect) {
             // let boundary_x_coords = self.rect_right_boundary_x_coords(rect);
             let boundary_x_coords = rect.right_boundary_x_coords();
@@ -208,25 +208,25 @@ impl Boundaries {
         }
         vte_output
     }
-    fn rect_right_boundary_is_before_screen_edge (&self, rect: &dyn Rect) -> bool {
+    fn rect_right_boundary_is_before_screen_edge <R: Rect>(&self, rect: &R) -> bool {
         rect.x() + rect.columns() < self.columns
     }
-    fn rect_bottom_boundary_is_before_screen_edge(&self, rect: &dyn Rect) -> bool {
+    fn rect_bottom_boundary_is_before_screen_edge<R: Rect>(&self, rect: &R) -> bool {
         rect.y() + rect.rows() < self.rows
     }
-    fn rect_right_boundary_row_start(&self, rect: &dyn Rect) -> usize {
+    fn rect_right_boundary_row_start<R: Rect>(&self, rect: &R) -> usize {
         if rect.y() == 0 { 0 } else { rect.y() - 1 }
     }
-    fn rect_right_boundary_row_end(&self, rect: &dyn Rect) -> usize {
+    fn rect_right_boundary_row_end<R: Rect>(&self, rect: &R) -> usize {
         let rect_bottom_row = rect.y() + rect.rows();
         // we do this because unless we're on the screen edge, we'd like to go one extra row to
         // connect to whatever boundary is beneath us
         if rect_bottom_row == self.rows { rect_bottom_row } else { rect_bottom_row + 1 }
     }
-    fn rect_bottom_boundary_col_start(&self, rect: &dyn Rect) -> usize {
+    fn rect_bottom_boundary_col_start<R: Rect>(&self, rect: &R) -> usize {
         if rect.x() == 0 { 0 } else { rect.x() - 1 }
     }
-    fn rect_bottom_boundary_col_end(&self, rect: &dyn Rect) -> usize {
+    fn rect_bottom_boundary_col_end<R: Rect>(&self, rect: &R) -> usize {
         let rect_right_col = rect.x() + rect.columns();
         // we do this because unless we're on the screen edge, we'd like to go one extra column to
         // connect to whatever boundary is right of us