diff --git a/src/test/rustdoc-ui/normalize-overflow.rs b/src/test/rustdoc-ui/normalize-overflow.rs
index 0cdcc88e3141f..3698fe70e7f7e 100644
--- a/src/test/rustdoc-ui/normalize-overflow.rs
+++ b/src/test/rustdoc-ui/normalize-overflow.rs
@@ -1,3 +1,5 @@
 // aux-crate:overflow=overflow.rs
 // check-pass
 // Regression test for <https://github.com/rust-lang/rust/issues/79506>.
+
+extern crate overflow;