diff --git a/db/db_impl/db_impl.h b/db/db_impl/db_impl.h
index b38b6d14f7..0b65bd41da 100644
--- a/db/db_impl/db_impl.h
+++ b/db/db_impl/db_impl.h
@@ -1189,11 +1189,6 @@ class DBImpl : public DB {
                               ColumnFamilyHandle* column_family,
                               const Slice* begin, const Slice* end);
 
-  Status GetApproximateSizesInternal(const SizeApproximationOptions& options,
-                                     ColumnFamilyHandle* column_family,
-                                     const Range* range, int n,
-                                     uint64_t* sizes);
-
   // The following two functions can only be called when:
   // 1. WriteThread::Writer::EnterUnbatched() is used.
   // 2. db_mutex is NOT held