diff --git a/serde_codegen/Cargo.toml b/serde_codegen/Cargo.toml
index b28ae608..8f0b272f 100644
--- a/serde_codegen/Cargo.toml
+++ b/serde_codegen/Cargo.toml
@@ -22,7 +22,7 @@ with-syn = []
 
 [dependencies]
 clippy = { version = "^0.*", optional = true }
-quote = "0.3"
+quote = "0.3.8"
 serde_codegen_internals = { version = "=0.11.1", default-features = false, path = "../serde_codegen_internals" }
 syn = { version = "0.10", features = ["aster", "visit"] }
 syntex = { version = "^0.50.0", optional = true }
diff --git a/serde_codegen/src/lib.rs b/serde_codegen/src/lib.rs
index 1b2e18c5..a2afd7bd 100644
--- a/serde_codegen/src/lib.rs
+++ b/serde_codegen/src/lib.rs
@@ -159,15 +159,15 @@ mod shim {
 #[cfg(feature = "with-syn")]
 #[doc(hidden)]
 /// Not public API. Use the serde_derive crate.
-pub fn expand_derive_serialize(item: &str) -> Result<String, String> {
+pub fn expand_derive_serialize(item: &str) -> Result<quote::Tokens, String> {
     let syn_item = syn::parse_macro_input(item).unwrap();
-    ser::expand_derive_serialize(&syn_item).map(|derive| derive.to_string())
+    ser::expand_derive_serialize(&syn_item)
 }
 
 #[cfg(feature = "with-syn")]
 #[doc(hidden)]
 /// Not public API. Use the serde_derive crate.
-pub fn expand_derive_deserialize(item: &str) -> Result<String, String> {
+pub fn expand_derive_deserialize(item: &str) -> Result<quote::Tokens, String> {
     let syn_item = syn::parse_macro_input(item).unwrap();
-    de::expand_derive_deserialize(&syn_item).map(|derive| derive.to_string())
+    de::expand_derive_deserialize(&syn_item)
 }