diff --git a/src/io/rsm/rsm_client.hpp b/src/io/rsm/rsm_client.hpp
index b863e79a4..cf56b1151 100644
--- a/src/io/rsm/rsm_client.hpp
+++ b/src/io/rsm/rsm_client.hpp
@@ -94,7 +94,7 @@ class RsmClient {
 
   BasicResult<TimedOut, WriteResponseT> SendWriteRequest(WriteRequestT req) {
     Notifier notifier;
-    ReadinessToken readiness_token{0};
+    const ReadinessToken readiness_token{0};
     SendAsyncWriteRequest(req, notifier, readiness_token);
     auto poll_result = AwaitAsyncWriteRequest(readiness_token);
     while (!poll_result) {