diff --git a/config/.cvsignore b/config/.cvsignore
index b13365ae5df..7d24243f49e 100644
--- a/config/.cvsignore
+++ b/config/.cvsignore
@@ -10,3 +10,4 @@ bsdecho
 build_number
 master.pl
 master.ini
+nsBuildID.h