diff --git a/umem.spec.in b/umem.spec.in
index 3e42d3b..5e3046c 100644
--- a/umem.spec.in
+++ b/umem.spec.in
@@ -6,7 +6,7 @@ Summary:        Port of Solaris's slab allocator.
 Group:          System Environment/Libraries
 License:        CDDL
 URL:            http://sourceforge.net/projects/umem/
-Source0:        %{name}-%{version}.tar.gz
+Source0:        %{name}-%{version}.tar.bz2
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 BuildRequires:  autoconf >= 2.50