diff --git a/configure.ac b/configure.ac
index 777845d..6155bde 100644
--- a/configure.ac
+++ b/configure.ac
@@ -61,6 +61,11 @@
 
 AC_DEFINE(HAVE_REDIS, [1], [Have redis])
 AM_CONDITIONAL([REDIS], [test xtrue])
+
+# @TODO Change to true when Redis HA support is activated.
+AC_DEFINE(HAVE_SENTINEL, [0], [Have sentinel])
+AM_CONDITIONAL([SENTINEL], [test "xyes" = "xno"])
+
 PKG_CHECK_MODULES([HIREDIS], [hiredis])
 AC_DEFINE(HAVE_HIREDIS, [1], [Have hiredis])
 AM_CONDITIONAL([HIREDIS], [test xtrue])