diff --git a/serde2/src/json/ser.rs b/serde2/src/json/ser.rs
index a74b87b8..7b3f7fc0 100644
--- a/serde2/src/json/ser.rs
+++ b/serde2/src/json/ser.rs
@@ -29,6 +29,7 @@ impl<W: io::Writer> Writer<W> {
 }
 
 impl<W: io::Writer> ser::Serializer<W, (), IoError> for Writer<W> {
+    #[inline]
     fn visit<
         T: ser::Serialize,
     >(&mut self, value: &T) -> Result<(), IoError> {