diff --git a/sstables/mx/writer.cc b/sstables/mx/writer.cc
index 69141c7fec..4348e91808 100644
--- a/sstables/mx/writer.cc
+++ b/sstables/mx/writer.cc
@@ -816,6 +816,7 @@ public:
     stop_iteration consume(range_tombstone_change&& rtc) override;
     stop_iteration consume_end_of_partition() override;
     void consume_end_of_stream() override;
+    uint64_t data_file_position_for_tests() const override;
 };
 
 writer::~writer() {
@@ -1545,6 +1546,10 @@ void writer::consume_end_of_stream() {
     _sst.seal_sstable(_cfg.backup).get();
 }
 
+uint64_t writer::data_file_position_for_tests() const {
+    return _data_writer->offset();
+}
+
 std::unique_ptr<sstable_writer::writer_impl> make_writer(sstable& sst,
         const schema& s,
         uint64_t estimated_partitions,
diff --git a/sstables/sstable_writer.hh b/sstables/sstable_writer.hh
index 9bc315962d..29f16682f3 100644
--- a/sstables/sstable_writer.hh
+++ b/sstables/sstable_writer.hh
@@ -44,6 +44,7 @@ public:
     stop_iteration consume_end_of_partition();
     void consume_end_of_stream();
     void set_repaired_at(int64_t repaired_at);
+    uint64_t data_file_position_for_tests() const;
 };
 
 } // namespace sstables
diff --git a/sstables/writer.cc b/sstables/writer.cc
index a652c2559f..43677b357e 100644
--- a/sstables/writer.cc
+++ b/sstables/writer.cc
@@ -77,6 +77,10 @@ void sstable_writer::set_repaired_at(int64_t repaired_at) {
     _impl->set_repaired_at(repaired_at);
 }
 
+uint64_t sstable_writer::data_file_position_for_tests() const {
+    return _impl->data_file_position_for_tests();
+}
+
 sstable_writer::sstable_writer(sstable_writer&& o) = default;
 sstable_writer& sstable_writer::operator=(sstable_writer&& o) = default;
 sstable_writer::~sstable_writer() {
diff --git a/sstables/writer_impl.hh b/sstables/writer_impl.hh
index ab533be098..cf6e0468e2 100644
--- a/sstables/writer_impl.hh
+++ b/sstables/writer_impl.hh
@@ -52,6 +52,7 @@ struct sstable_writer::writer_impl {
     void set_repaired_at(uint64_t repaired_at) {
         _collector.set_repaired_at(repaired_at);
     }
+    virtual uint64_t data_file_position_for_tests() const = 0;
 };
 
 }