diff --git a/src/visibility.rs b/src/visibility.rs
index 24fdca9..7ce3cd8 100644
--- a/src/visibility.rs
+++ b/src/visibility.rs
@@ -76,7 +76,7 @@ impl Viewshed {
                     for e in entities {
                         new_visible_entities.insert(*e);
                     }
-                    if entities.contains(&viewer_entity) {
+                    if entities.contains(viewer_entity) {
                         return 0;
                     } else {
                         return *opacity;
@@ -107,7 +107,7 @@ impl Viewshed {
                 for e in &entities {
                     new_visible_entities.insert(*e);
                 }
-                if entities.contains(&viewer_entity) {
+                if entities.contains(viewer_entity) {
                     0
                 } else {
                     cache.insert(coord, (opacity, entities));