diff --git a/compiler/rustc_driver/src/lib.rs b/compiler/rustc_driver/src/lib.rs
index f434673c39e10..a192c2eb94ec8 100644
--- a/compiler/rustc_driver/src/lib.rs
+++ b/compiler/rustc_driver/src/lib.rs
@@ -1288,12 +1288,12 @@ pub fn init_env_logger(env: &str) {
         .with_indent_lines(true)
         .with_ansi(true)
         .with_targets(true)
-        .with_thread_ids(true)
-        .with_thread_names(true)
         .with_wraparound(10)
         .with_verbose_exit(true)
         .with_verbose_entry(true)
         .with_indent_amount(2);
+    #[cfg(parallel_compiler)]
+    let layer = layer.with_thread_ids(true).with_thread_names(true);
 
     use tracing_subscriber::layer::SubscriberExt;
     let subscriber = tracing_subscriber::Registry::default().with(filter).with(layer);