diff --git a/src/alejandra_engine/src/rules/string.rs b/src/alejandra_engine/src/rules/string.rs
index 8506e91..35064e3 100644
--- a/src/alejandra_engine/src/rules/string.rs
+++ b/src/alejandra_engine/src/rules/string.rs
@@ -43,8 +43,7 @@ pub(crate) fn rule(
             })
             .collect();
 
-        let lines: Vec<String> =
-            content.split('\n').map(|line| line.to_string()).collect();
+        let lines: Vec<&str> = content.split('\n').collect();
 
         let should_trim_end: bool =
             !lines.is_empty() && lines[lines.len() - 1].trim().is_empty();