diff --git a/byacc.spec b/byacc.spec
index 8f11a51..d505332 100644
--- a/byacc.spec
+++ b/byacc.spec
@@ -7,7 +7,7 @@ Release: 2%{?dist}
 License: Public Domain
 Group: Development/Tools
 URL: http://invisible-island.net/byacc/byacc.html
-Source: ftp://invisible-island.net/byacc/byacc-%{byaccdate}.tar.gz
+Source: ftp://invisible-island.net/byacc/byacc-%{byaccdate}.tgz
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 %description