diff --git a/serde/build.rs b/serde/build.rs
index 35a74a5c..c5307ab4 100644
--- a/serde/build.rs
+++ b/serde/build.rs
@@ -91,7 +91,7 @@ fn main() {
 
         // Whitelist of archs that support std::sync::atomic module. Ideally we
         // would use #[cfg(target_has_atomic = "...")] but it is not stable yet.
-        // Instead this is based on rustc's src/librustc_target/spec/*.rs.
+        // Instead this is based on rustc's compiler/rustc_target/src/spec/*.rs.
         let has_atomic64 = target.starts_with("x86_64")
             || target.starts_with("i686")
             || target.starts_with("aarch64")