diff --git a/crates/proc-macro-test/build.rs b/crates/proc-macro-test/build.rs
index cec2f87b327..5502e3ba7c9 100644
--- a/crates/proc-macro-test/build.rs
+++ b/crates/proc-macro-test/build.rs
@@ -35,7 +35,7 @@ fn main() {
     println!("Creating {}", src_dir.display());
     std::fs::create_dir_all(src_dir).unwrap();
 
-    for item_els in [&["Cargo.toml"][..], &["Cargo.lock"], &["src", "lib.rs"]] {
+    for item_els in [&["Cargo.toml"][..], &["src", "lib.rs"]] {
         let mut src = imp_dir.clone();
         let mut dst = staging_dir.clone();
         for el in item_els {