diff --git a/.cvsignore b/.cvsignore
index dc52b01ee6c5a2df6b2ae9cf8ff5e9cf3e9a620d..0e8075179ca7f186c96cd0b677d5cc4740ef0b51 100755
--- a/.cvsignore
+++ b/.cvsignore
@@ -13,3 +13,4 @@ update.out
 .tags-sources
 tags
 TAGS
+*.os