diff --git a/doc/asn1c-usage.lyx b/doc/asn1c-usage.lyx
index a97f3a534814047cddae41c4366ab7210a76772c..438e7b08a2b31d5ae7813273c9ae4c46fa27269a 100644
--- a/doc/asn1c-usage.lyx
+++ b/doc/asn1c-usage.lyx
@@ -55,7 +55,7 @@ status Open
 \layout Standard
 
 \backslash 
-extramarks{Document revision $Revision$}{}
+extramarks{$Revision$}{}
 \end_inset