diff --git a/src/librustc_lexer/Cargo.toml b/src/librustc_lexer/Cargo.toml
index 9c0230e8322..9dcd39ee039 100644
--- a/src/librustc_lexer/Cargo.toml
+++ b/src/librustc_lexer/Cargo.toml
@@ -7,3 +7,7 @@ edition = "2018"
 # Note that this crate purposefully does not depend on other rustc crates
 [dependencies]
 unicode-xid = { version = "0.1.0", optional = true }
+
+[lib]
+doctest = false
+name = "rustc_lexer"