diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index 811c7df5d9978a002e5764b43d03d2ba36ff929f..d7f795e4055341c3322ff47d7b83db2bd1a73c90 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -427,7 +427,7 @@ pub fn rustdoc_cmd(&self, compiler: Compiler) -> Command {
             } else {
                 self.sysroot(compiler)
             })
-            .env("RUSTC_LIBDIR", self.sysroot_libdir(compiler, self.build.build))
+            .env("RUSTC_LIBDIR", self.rustc_libdir(compiler))
             .env("CFG_RELEASE_CHANNEL", &self.build.config.channel)
             .env("RUSTDOC_REAL", self.rustdoc(compiler));
         cmd