diff --git a/mdbx.h b/mdbx.h
index ddf1a040..e3ee6cef 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -1,4 +1,4 @@
-/* LICENSE AND COPYRUSTING *****************************************************
+/* LICENSE AND COPYRUSTING *****************************************************
  *
  * Copyright 2015-2018 Leonid Yuriev <leo@yuriev.ru>
  * and other libmdbx authors: please see AUTHORS file.
@@ -1601,7 +1601,7 @@ LIBMDBX_API int mdbx_env_set_syncbytes(MDBX_env *env, size_t bytes);
  * [out] percent  Percentage of page allocation in the database.
  *
  * Returns Number of transactions committed after the given was started for
- * read, or -1 on failure. */
+ * read, or negative value on failure. */
 LIBMDBX_API int mdbx_txn_straggler(MDBX_txn *txn, int *percent);
 
 /* A callback function for killing a laggard readers,
diff --git a/src/mdbx.c b/src/mdbx.c
index 1f9357d2..6e59a42b 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -12810,7 +12810,7 @@ int mdbx_txn_straggler(MDBX_txn *txn, int *percent)
       *percent =
           (int)((txn->mt_next_pgno * UINT64_C(100) + txn->mt_end_pgno / 2) /
                 txn->mt_end_pgno);
-    return -1;
+    return 0;
   }
 
   txnid_t recent;