diff --git a/lib/lyx2lyx/LyX.py b/lib/lyx2lyx/LyX.py
index 66108dca2c..1e2147d549 100644
--- a/lib/lyx2lyx/LyX.py
+++ b/lib/lyx2lyx/LyX.py
@@ -85,7 +85,7 @@ format_relation = [("0_06",    [200], minor_versions("0.6" , 4)),
                    ("1_5", list(range(246,277)), minor_versions("1.5" , 7)),
                    ("1_6", list(range(277,346)), minor_versions("1.6" , 10)),
                    ("2_0", list(range(346,414)), minor_versions("2.0" , 8)),
-                   ("2_1", list(range(414,475)), minor_versions("2.1" , 0)),
+                   ("2_1", list(range(414,475)), minor_versions("2.1" , 5)),
                    ("2_2", list(range(475,509)), minor_versions("2.2" , 0))
                   ]