diff --git a/mdbx.h b/mdbx.h
index f702fc46..ece77eda 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -1937,7 +1937,7 @@ enum MDBX_error_t {
   MDBX_DUPLICATED_CLK = -30413,
 
   /* The last of MDBX-added error codes */
-  MDBX_LAST_ADDED_ERRCODE = MDBX_TXN_OVERLAPPING,
+  MDBX_LAST_ADDED_ERRCODE = MDBX_DUPLICATED_CLK,
 
 #if defined(_WIN32) || defined(_WIN64)
   MDBX_ENODATA = ERROR_HANDLE_EOF,