diff --git a/compiler/rustc_builtin_macros/src/format.rs b/compiler/rustc_builtin_macros/src/format.rs
index 3b7e2102ffa..2d1fd81c32f 100644
--- a/compiler/rustc_builtin_macros/src/format.rs
+++ b/compiler/rustc_builtin_macros/src/format.rs
@@ -1004,9 +1004,7 @@ fn lint_named_arguments_used_positionally(
                 node_id: ast::CRATE_NODE_ID,
                 lint_id: LintId::of(&NAMED_ARGUMENTS_USED_POSITIONALLY),
                 diagnostic: BuiltinLintDiagnostics::NamedArgumentUsedPositionally(
-                    arg_span,
-                    span,
-                    symbol.to_string(),
+                    arg_span, span, symbol,
                 ),
             });
         }
diff --git a/compiler/rustc_lint_defs/src/lib.rs b/compiler/rustc_lint_defs/src/lib.rs
index 4fd57ed8533..3872d866dee 100644
--- a/compiler/rustc_lint_defs/src/lib.rs
+++ b/compiler/rustc_lint_defs/src/lib.rs
@@ -467,7 +467,7 @@ pub enum BuiltinLintDiagnostics {
         /// If true, the lifetime will be fully elided.
         use_span: Option<(Span, bool)>,
     },
-    NamedArgumentUsedPositionally(Option<Span>, Span, String),
+    NamedArgumentUsedPositionally(Option<Span>, Span, Symbol),
 }
 
 /// Lints that are buffered up early on in the `Session` before the