diff --git a/src/test/rustdoc/intra-link-prim-methods-external-core.rs b/src/test/rustdoc/intra-link-prim-methods-external-core.rs
index 85e017e89b1..a7f243f63a8 100644
--- a/src/test/rustdoc/intra-link-prim-methods-external-core.rs
+++ b/src/test/rustdoc/intra-link-prim-methods-external-core.rs
@@ -1,4 +1,5 @@
 // aux-build:my-core.rs
+// build-aux-docs
 // ignore-cross-compile
 
 #![deny(intra_doc_link_resolution_failure)]