diff --git a/src/grid.rs b/src/grid.rs
index cc49c3d..8f67399 100644
--- a/src/grid.rs
+++ b/src/grid.rs
@@ -206,13 +206,13 @@ mod tests {
     #[should_panic]
     fn test_grid_new_panics() {
         let mut rng = rand::thread_rng();
-        let _ = Grid::new(5, 5, &mut rng);
+        let _ = Grid::new(5, 5, &mut rng, vec![]);
     }
 
     #[test]
     fn test_grid_new() {
         let mut rng = rand::thread_rng();
-        let grid = Grid::new(8, 8, &mut rng);
+        let grid = Grid::new(8, 8, &mut rng, vec![]);
         assert_eq!(grid.index(0.5, 0.6), 0);
         assert_eq!(grid.index(1.5, 0.6), 1);
         assert_eq!(grid.index(0.5, 1.6), 8);
diff --git a/src/model.rs b/src/model.rs
index 6dd65cc..39f7822 100644
--- a/src/model.rs
+++ b/src/model.rs
@@ -161,14 +161,14 @@ impl Model {
         println!("Doing some population stuff...");
         let time_1 = Instant::now();
         let mut i_pop: Vec<Vec<usize>> = Vec::new();
-        for i in (0..(self.grids.len())) {
+        for _i in 0..(self.grids.len()) {
             i_pop.push(vec![]);
         }
         for agent in self.agents.iter() {
             i_pop[agent.population_id].push(agent.i);
         }
         
-        for i in (0..(self.grids.len())) {
+        for i in 0..(self.grids.len()) {
             self.grids[i].i = i_pop[i].clone();
         }        
         println!("Took {}ms", time_1.elapsed().as_millis());
@@ -244,7 +244,7 @@ impl Model {
             if use_exp_deposit {
                 let agent_list = self.agents.clone();
                 self.grids.par_iter_mut().for_each(|grid|{
-                    for i in (0..grid.i.len()) {
+                    for i in 0..grid.i.len() {
                         let agent = &agent_list[i];
                         grid.deposit(agent.x, agent.y);
                     }