diff --git a/compaction/compaction.cc b/compaction/compaction.cc
index ab8fd9df8451..fce3fe1e5dc6 100644
--- a/compaction/compaction.cc
+++ b/compaction/compaction.cc
@@ -788,7 +788,7 @@ class compaction {
         log_info("{} {} sstables to {}. {} to {} (~{}% of original) in {}ms = {}. ~{} total partitions merged to {}.",
                 report_finish_desc(),
                 _input_sstable_generations.size(), new_sstables_msg, utils::pretty_printed_data_size(_start_size), utils::pretty_printed_data_size(_end_size), int(ratio * 100),
-                std::chrono::duration_cast<std::chrono::milliseconds>(duration).count(), utils::pretty_printed_throughput(_end_size, duration),
+                std::chrono::duration_cast<std::chrono::milliseconds>(duration).count(), utils::pretty_printed_throughput(_start_size, duration),
                 _cdata.total_partitions, _cdata.total_keys_written);
 
         return ret;