diff --git a/lib/doc/Math.lyx b/lib/doc/Math.lyx
index 0396331529..acb3284f03 100644
--- a/lib/doc/Math.lyx
+++ b/lib/doc/Math.lyx
@@ -1,5 +1,5 @@
 #LyX 1.6.0rc3 created this file. For more info see http://www.lyx.org/
-\lyxformat 341
+\lyxformat 340
 \begin_document
 \begin_header
 \textclass scrartcl
diff --git a/lib/doc/de/Math.lyx b/lib/doc/de/Math.lyx
index c6bb9d4ec9..413d8127a4 100644
--- a/lib/doc/de/Math.lyx
+++ b/lib/doc/de/Math.lyx
@@ -1,5 +1,5 @@
 #LyX 1.6.0rc3 created this file. For more info see http://www.lyx.org/
-\lyxformat 341
+\lyxformat 340
 \begin_document
 \begin_header
 \textclass scrartcl