diff --git a/src/check_ast.rs b/src/check_ast.rs
index ec30f5696f..559f979428 100644
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
@@ -1698,7 +1698,7 @@ impl<'a> Checker<'a> {
                                         context.defined_by,
                                         context.defined_in,
                                     ))
-                                    .or_insert(vec![]);
+                                    .or_default();
                                 full_names.push(full_name);
                             }
                             BindingKind::Importation(full_name, context)
@@ -1709,7 +1709,7 @@ impl<'a> Checker<'a> {
                                         context.defined_by,
                                         context.defined_in,
                                     ))
-                                    .or_insert(vec![]);
+                                    .or_default();
                                 full_names.push(full_name);
                             }
                             _ => {}
diff --git a/src/noqa.rs b/src/noqa.rs
index d1413104b4..01a59974e1 100644
--- a/src/noqa.rs
+++ b/src/noqa.rs
@@ -104,9 +104,7 @@ fn add_noqa_inner(
             .unwrap_or(lineno);
 
         if !codes.is_empty() {
-            let matches = matches_by_line
-                .entry(noqa_lineno)
-                .or_insert_with(BTreeSet::new);
+            let matches = matches_by_line.entry(noqa_lineno).or_default();
             matches.append(&mut codes);
         }
     }