diff --git a/examples/heapsize2/heapsize_derive/src/lib.rs b/examples/heapsize2/heapsize_derive/src/lib.rs
index 3389b61..fd5e448 100644
--- a/examples/heapsize2/heapsize_derive/src/lib.rs
+++ b/examples/heapsize2/heapsize_derive/src/lib.rs
@@ -1,4 +1,6 @@
 extern crate proc_macro;
+
+#[macro_use]
 extern crate syn;
 
 #[macro_use]
@@ -49,8 +51,7 @@
 fn add_trait_bounds(mut generics: Generics) -> Generics {
     for param in &mut generics.params {
         if let GenericParam::Type(ref mut type_param) = *param {
-            let bound = syn::parse(quote!(HeapSize).into()).unwrap();
-            type_param.bounds.push(bound);
+            type_param.bounds.push(parse_quote!(HeapSize));
         }
     }
     generics
diff --git a/src/lib.rs b/src/lib.rs
index ce9a830..292cbfb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -296,6 +296,17 @@
     Ok(file)
 }
 
+#[cfg(all(feature = "parsing", feature = "printing"))]
+#[macro_export]
+macro_rules! parse_quote {
+    ($($tt:tt)*) => {
+        ::std::result::Result::unwrap(
+            $crate::parse(
+                ::std::convert::Into::into(
+                    quote!($($tt)*))))
+    };
+}
+
 #[cfg(feature = "printing")]
 struct TokensOrDefault<'a, T: 'a>(&'a Option<T>);