diff --git a/configure.ac b/configure.ac
index 7effb9f3..54095272 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,6 +13,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+AC_PREREQ([2.64])
+
 AC_INIT(
     [purple-facebook],
     m4_esyscmd_s([cat VERSION]),