diff --git a/src/ast/checks.rs b/src/ast/checks.rs
index d0d7a25102..6fe2beea9a 100644
--- a/src/ast/checks.rs
+++ b/src/ast/checks.rs
@@ -311,7 +311,7 @@ pub fn check_repeated_keys(
                 (Some(DictionaryKey::Variable(v1)), Some(DictionaryKey::Variable(v2))) => {
                     if check_repeated_variables && v1 == v2 {
                         checks.push(Check::new(
-                            CheckKind::MultiValueRepeatedKeyVariable(v2.to_string()),
+                            CheckKind::MultiValueRepeatedKeyVariable((*v2).to_string()),
                             k2.location,
                         ))
                     }
diff --git a/src/check_ast.rs b/src/check_ast.rs
index f689ac73b9..7347dcbbf6 100644
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
@@ -997,7 +997,7 @@ impl<'a> Checker<'a> {
 
         for builtin in BUILTINS {
             scope.values.insert(
-                builtin.to_string(),
+                (*builtin).to_string(),
                 Binding {
                     kind: BindingKind::Builtin,
                     location: Default::default(),
@@ -1007,7 +1007,7 @@ impl<'a> Checker<'a> {
         }
         for builtin in MAGIC_GLOBALS {
             scope.values.insert(
-                builtin.to_string(),
+                (*builtin).to_string(),
                 Binding {
                     kind: BindingKind::Builtin,
                     location: Default::default(),