diff --git a/crates/proc_macro_api/src/lib.rs b/crates/proc_macro_api/src/lib.rs
index 0537286dd1..40fdbfd5a4 100644
--- a/crates/proc_macro_api/src/lib.rs
+++ b/crates/proc_macro_api/src/lib.rs
@@ -23,7 +23,7 @@ use crate::process::{ProcMacroProcessSrv, ProcMacroProcessThread};
 pub use rpc::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask, ProcMacroKind};
 
 #[derive(Debug, Clone)]
-pub struct ProcMacroProcessExpander {
+struct ProcMacroProcessExpander {
     process: Arc<ProcMacroProcessSrv>,
     dylib_path: PathBuf,
     name: SmolStr,