diff --git a/trunk/src/utest/srs_utest_config.cpp b/trunk/src/utest/srs_utest_config.cpp
index ec6bef58f..6f75d5eb9 100644
--- a/trunk/src/utest/srs_utest_config.cpp
+++ b/trunk/src/utest/srs_utest_config.cpp
@@ -1973,7 +1973,7 @@ VOID TEST(ConfigUnitTest, CheckDefaultValuesVhost)
 
     if (true) {
 	    HELPER_ASSERT_SUCCESS(conf.parse(_MIN_OK_CONF));
-	    EXPECT_EQ(srs_utime_t(9.9 * SRS_UTIME_SECONDS), conf.get_heartbeat_interval());
+	    EXPECT_EQ(srs_utime_t(10 * SRS_UTIME_SECONDS), conf.get_heartbeat_interval());
 
 	    HELPER_ASSERT_SUCCESS(conf.parse(_MIN_OK_CONF "heartbeat{interval 10;}"));
 	    EXPECT_EQ(10 * SRS_UTIME_SECONDS, conf.get_heartbeat_interval());