diff --git a/crates/proc-macro-srv-cli/src/main.rs b/crates/proc-macro-srv-cli/src/main.rs
index 0f23a7daaf..8398f2ba6c 100644
--- a/crates/proc-macro-srv-cli/src/main.rs
+++ b/crates/proc-macro-srv-cli/src/main.rs
@@ -2,6 +2,6 @@
 
 use proc_macro_srv::cli;
 
-fn main() {
-    cli::run().unwrap();
+fn main() -> std::io::Result<()> {
+    cli::run()
 }