diff --git a/src/raft_log.rs b/src/raft_log.rs
index fcfcf32e..d0fe2b32 100644
--- a/src/raft_log.rs
+++ b/src/raft_log.rs
@@ -19,6 +19,7 @@ use std::cmp;
 use slog::warn;
 use slog::Logger;
 
+use crate::derializer::format_entry;
 use crate::eraftpb::{Entry, Snapshot};
 use crate::errors::{Error, Result, StorageError};
 use crate::log_unstable::Unstable;
@@ -359,7 +360,7 @@ impl<T: Storage> RaftLog<T> {
         trace!(
             self.unstable.logger,
             "Entries being appended to unstable list";
-            "ents" => ?ents,
+            "ents" => ents.iter().map(|e| format_entry(e)).collect::<Vec<String>>().join(", "),
         );
         if ents.is_empty() {
             return self.last_index();