diff --git a/serde_codegen/src/de.rs b/serde_codegen/src/de.rs
index 5d5412f8..1ac5e415 100644
--- a/serde_codegen/src/de.rs
+++ b/serde_codegen/src/de.rs
@@ -65,7 +65,6 @@ pub fn expand_derive_deserialize(
     let where_clause = &impl_generics.where_clause;
 
     let impl_item = quote_item!(cx,
-        #[automatically_derived]
         impl $impl_generics ::serde::de::Deserialize for $ty $where_clause {
             fn deserialize<__D>(deserializer: &mut __D) -> ::std::result::Result<$ty, __D::Error>
                 where __D: ::serde::de::Deserializer,
diff --git a/serde_codegen/src/ser.rs b/serde_codegen/src/ser.rs
index 044a1297..1a9d4a59 100644
--- a/serde_codegen/src/ser.rs
+++ b/serde_codegen/src/ser.rs
@@ -60,7 +60,6 @@ pub fn expand_derive_serialize(
     let where_clause = &impl_generics.where_clause;
 
     let impl_item = quote_item!(cx,
-        #[automatically_derived]
         impl $impl_generics ::serde::ser::Serialize for $ty $where_clause {
             fn serialize<__S>(&self, serializer: &mut __S) -> ::std::result::Result<(), __S::Error>
                 where __S: ::serde::ser::Serializer,