diff --git a/configure.in b/configure.in
index d2426384b3d..39546693c38 100644
--- a/configure.in
+++ b/configure.in
@@ -646,7 +646,7 @@ if test "$PHP_GCOV" = "yes"; then
     AC_MSG_ERROR([ccache must be disabled when --enable-gcov option is used. You can disable ccache by setting environment variable CCACHE_DISABLE=1.])
   fi
   
-  ltp_version_list="1.5"
+  ltp_version_list="1.5 1.6"
 
   AC_CHECK_PROG(LTP, lcov, lcov)
   AC_CHECK_PROG(LTP_GENHTML, genhtml, genhtml)