diff --git a/unittests/api_tests.cpp b/unittests/api_tests.cpp
index b4b903d55c..a226866116 100644
--- a/unittests/api_tests.cpp
+++ b/unittests/api_tests.cpp
@@ -3880,7 +3880,7 @@ BOOST_AUTO_TEST_CASE(set_finalizer_test) { try {
    BOOST_TEST(!!ext);
    BOOST_TEST(std::get<hs_finalizer_set_extension>(*ext).finalizers.size() == finalizers.size());
    BOOST_TEST(std::get<hs_finalizer_set_extension>(*ext).generation == 1);
-   BOOST_TEST(std::get<hs_finalizer_set_extension>(*ext).fthreshold == finalizers.size() / 3 * 2);
+   BOOST_TEST(std::get<hs_finalizer_set_extension>(*ext).fthreshold == finalizers.size() / 3 * 2 + 1);
 
    // old dpos still in affect until block is irreversible
    BOOST_TEST(block->confirmed == 0);