diff --git a/internal/core/src/storage/Util.cpp b/internal/core/src/storage/Util.cpp
index 59b3c014ef..28c7d2a57f 100644
--- a/internal/core/src/storage/Util.cpp
+++ b/internal/core/src/storage/Util.cpp
@@ -469,7 +469,7 @@ EncodeAndUploadIndexSlice2(std::shared_ptr<milvus_storage::Space> space,
     auto status = space->WriteBolb(
         object_key, serialized_index_data.data(), serialized_index_size);
     AssertInfo(status.ok(),
-               fmt::format("write to space error: %s", status.ToString()));
+               fmt::format("write to space error: {}", status.ToString()));
     return std::make_pair(std::move(object_key), serialized_index_size);
 }