diff --git a/rtems/config/tools/rtems-gdb-7.7-1.cfg b/rtems/config/tools/rtems-gdb-7.7-1.cfg
index 2f053de..0f99725 100644
--- a/rtems/config/tools/rtems-gdb-7.7-1.cfg
+++ b/rtems/config/tools/rtems-gdb-7.7-1.cfg
@@ -6,6 +6,7 @@
 %include %{_configdir}/base.cfg
 
 %define gdb_version 7.7
+%define gdb_src_ext bz2
 
 %hash md5 gdb-%{gdb_version}.tar.bz2 271a18f41858a7e98b28ae4eb91287c9