diff --git a/serde_codegen/src/de.rs b/serde_codegen/src/de.rs
index cea5d05b..5608e709 100644
--- a/serde_codegen/src/de.rs
+++ b/serde_codegen/src/de.rs
@@ -24,11 +24,11 @@ pub fn expand_derive_deserialize(
     cx: &mut ExtCtxt,
     span: Span,
     meta_item: &MetaItem,
-    annotatable: Annotatable,
+    annotatable: &Annotatable,
     push: &mut FnMut(Annotatable)
 ) {
-    let item = match annotatable {
-        Annotatable::Item(item) => item,
+    let item = match *annotatable {
+        Annotatable::Item(ref item) => item,
         _ => {
             cx.span_err(
                 meta_item.span,
diff --git a/serde_codegen/src/ser.rs b/serde_codegen/src/ser.rs
index 0b046eaf..28b470de 100644
--- a/serde_codegen/src/ser.rs
+++ b/serde_codegen/src/ser.rs
@@ -19,11 +19,11 @@ pub fn expand_derive_serialize(
     cx: &mut ExtCtxt,
     span: Span,
     meta_item: &MetaItem,
-    annotatable: Annotatable,
+    annotatable: &Annotatable,
     push: &mut FnMut(Annotatable)
 ) {
-    let item = match annotatable {
-        Annotatable::Item(item) => item,
+    let item = match *annotatable {
+        Annotatable::Item(ref item) => item,
         _ => {
             cx.span_err(
                 meta_item.span,