diff --git a/configure.ac b/configure.ac
index a077d57..7166180 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,5 @@
 AC_INIT([Tock],[0.0.1],[tock-discuss@kent.ac.uk],[tock])
+AC_PREREQ([2.60])
 AC_CANONICAL_TARGET
 AM_INIT_AUTOMAKE