diff --git a/crates/toml/tests/testsuite/serde.rs b/crates/toml/tests/testsuite/serde.rs
index ae762b3d..d9d7a6db 100644
--- a/crates/toml/tests/testsuite/serde.rs
+++ b/crates/toml/tests/testsuite/serde.rs
@@ -743,7 +743,6 @@ fn newtype_variant() {
 }
 
 #[test]
-#[should_panic = "invalid type: string \"x\", expected tuple struct NewType"]
 fn newtype_key() {
     #[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Clone, Serialize, Deserialize)]
     struct NewType(String);
diff --git a/crates/toml_edit/src/de/key.rs b/crates/toml_edit/src/de/key.rs
index 3da41df4..a3b28256 100644
--- a/crates/toml_edit/src/de/key.rs
+++ b/crates/toml_edit/src/de/key.rs
@@ -62,9 +62,20 @@ impl<'de> serde::de::Deserializer<'de> for KeyDeserializer {
         self.deserialize_any(visitor)
     }
 
+    fn deserialize_newtype_struct<V>(
+        self,
+        _name: &'static str,
+        visitor: V,
+    ) -> Result<V::Value, Error>
+    where
+        V: serde::de::Visitor<'de>,
+    {
+        visitor.visit_newtype_struct(self)
+    }
+
     serde::forward_to_deserialize_any! {
         bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
-        bytes byte_buf map option unit newtype_struct
+        bytes byte_buf map option unit
         ignored_any unit_struct tuple_struct tuple identifier
     }
 }