diff --git a/src/librustdoc/test.rs b/src/librustdoc/test.rs
index c242eea236217..26f331ac7d1a4 100644
--- a/src/librustdoc/test.rs
+++ b/src/librustdoc/test.rs
@@ -67,6 +67,7 @@ pub fn run(input: &str,
         crate_types: vec![config::CrateTypeDylib],
         externs: externs.clone(),
         unstable_features: UnstableFeatures::from_environment(),
+        actually_rustdoc: true,
         ..config::basic_options().clone()
     };
 
diff --git a/src/test/run-pass-fulldeps/proc-macro/derive-test.rs b/src/test/run-pass-fulldeps/proc-macro/derive-test.rs
index a07e8b6cd7e64..5a53a4e8db34f 100644
--- a/src/test/run-pass-fulldeps/proc-macro/derive-test.rs
+++ b/src/test/run-pass-fulldeps/proc-macro/derive-test.rs
@@ -17,6 +17,9 @@ extern crate proc_macro;
 
 use proc_macro::TokenStream;
 
+// ```
+// assert!(true);
+// ```
 #[proc_macro_derive(Foo)]
 pub fn derive_foo(_input: TokenStream) -> TokenStream {
     "".parse().unwrap()