diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs
index 72a96e67f6e6..5601a950fbdb 100644
--- a/compiler/rustc_codegen_ssa/src/back/write.rs
+++ b/compiler/rustc_codegen_ssa/src/back/write.rs
@@ -2128,14 +2128,14 @@ fn drop(&mut self) {
 }
 
 pub struct OngoingCodegen<B: WriteBackendMethods> {
-    pub backend: B,
-    pub output_filenames: Arc<OutputFilenames>,
+    backend: B,
+    output_filenames: Arc<OutputFilenames>,
     // Field order below is intended to terminate the coordinator thread before two fields below
     // drop and prematurely close channels used by coordinator thread. See `Coordinator`'s
     // `Drop` implementation for more info.
-    pub coordinator: Coordinator<B>,
-    pub codegen_worker_receive: Receiver<CguMessage>,
-    pub shared_emitter_main: SharedEmitterMain,
+    pub(crate) coordinator: Coordinator<B>,
+    codegen_worker_receive: Receiver<CguMessage>,
+    shared_emitter_main: SharedEmitterMain,
 }
 
 impl<B: WriteBackendMethods> OngoingCodegen<B> {