diff --git a/src/librustc_lexer/Cargo.toml b/src/librustc_lexer/Cargo.toml
index 9c0230e83221f..0dbcda618ecac 100644
--- a/src/librustc_lexer/Cargo.toml
+++ b/src/librustc_lexer/Cargo.toml
@@ -7,3 +7,9 @@ edition = "2018"
 # Note that this crate purposefully does not depend on other rustc crates
 [dependencies]
 unicode-xid = { version = "0.1.0", optional = true }
+
+# Note: do not remove this blank `[lib]` section.
+# This will be used when publishing this crate as `rustc-ap-rustc_lexer`.
+[lib]
+doctest = false
+name = "rustc_lexer"