diff --git a/src/bytes/tests.rs b/src/bytes/tests.rs
index 9e8b9d38..968d8f52 100644
--- a/src/bytes/tests.rs
+++ b/src/bytes/tests.rs
@@ -10,6 +10,7 @@ use crate::Parser;
 use crate::{
   branch::alt,
   bytes::complete::{escaped, escaped_transform, tag},
+  character::complete::anychar,
   combinator::{map, value},
   lib::std::string::String,
   lib::std::vec::Vec,
@@ -278,6 +279,27 @@ fn escape_transform_str() {
   assert_eq!(esc3("a␛0bc␛n"), Ok(("", String::from("a\0bc\n"))));
 }
 
+#[cfg(feature = "std")]
+#[test]
+fn escape_transform_string() {
+  fn esc(i: &str) -> IResult<&str, String> {
+    escaped_transform(
+      alpha,
+      '\\',
+      alt((
+        value(String::from("\""), tag("\"")),
+        map(anychar, |c| format!("\\{}", c)),
+      )),
+    )(i)
+  }
+
+  assert_eq!(esc("abcd;"), Ok((";", String::from("abcd"))));
+  assert_eq!(esc(r#"ab\"cd;"#), Ok((";", String::from(r#"ab"cd"#))));
+  assert_eq!(esc(r#"\"abcd;"#), Ok((";", String::from(r#""abcd"#))));
+  assert_eq!(esc(r#"\n;"#), Ok((";", String::from(r#"\n"#))));
+  assert_eq!(esc(r#"ab\"12"#), Ok(("12", String::from(r#"ab""#))));
+}
+
 #[test]
 fn take_until_incomplete() {
   use crate::bytes::streaming::take_until;
diff --git a/src/traits.rs b/src/traits.rs
index 782bc4aa..78d25c1d 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -1209,6 +1209,21 @@ impl ExtendInto for &str {
   }
 }
 
+#[cfg(feature = "alloc")]
+impl ExtendInto for String {
+  type Item = char;
+  type Extender = String;
+
+  #[inline]
+  fn new_builder(&self) -> String {
+    String::new()
+  }
+  #[inline]
+  fn extend_into(&self, acc: &mut String) {
+    acc.push_str(self);
+  }
+}
+
 #[cfg(feature = "alloc")]
 impl ExtendInto for char {
   type Item = char;