diff --git a/include/log++.h b/include/log++.h
index ac3cb93..ae2b141 100644
--- a/include/log++.h
+++ b/include/log++.h
@@ -409,13 +409,13 @@ if      constexpr(LPP_INTL::LppSeverity::severity == LPP_INTL::LppSeverity::I
 
 #if defined MODE_ROSLOG || defined MODE_LPP
 #define LOG_EVERY_N(severity, n) LPP_INTL::InternalPolicyLog<int>(LPP_GET_KEY(), n, LPP_INTL::toBase(LPP_INTL::GlogSeverity::severity), LPP_INTL::PolicyType::EVERY_N)
-#define LOG_EVERY_T(severity, t) LPP_INTL::InternalPolicyLog<float>(LPP_GET_KEY(), t, LPP_INTL::toBase(LPP_INTL::GlogSeverity::severity), LPP_INTL::PolicyType::TIMED)
+#define LOG_EVERY_T(severity, t) LPP_WARN("LOG_EVERY_T is only defined in GLOG v0.6 or newer.") LPP_INTL::InternalPolicyLog<float>(LPP_GET_KEY(), t, LPP_INTL::toBase(LPP_INTL::GlogSeverity::severity), LPP_INTL::PolicyType::TIMED)
 #define LOG_IF_EVERY_N(severity, condition, n) if (condition) LOG_EVERY_N(severity, n)
 #define LOG_FIRST_N(severity, n) LPP_INTL::InternalPolicyLog<int>(LPP_GET_KEY(), n, LPP_INTL::toBase(LPP_INTL::GlogSeverity::severity), LPP_INTL::PolicyType::FIRST_N)
 
 #define DLOG(severity) LPP_ASSERT_GLOG(LPP_INTL::GlogSeverity::severity); LPP_INTL::InternalLog(LPP_INTL::BaseSeverity::DEBUG)
 #define DLOG_EVERY_N(severity, n) LPP_ASSERT_GLOG(LPP_INTL::GlogSeverity::severity); LPP_INTL::InternalPolicyLog<int>(LPP_GET_KEY(), n, LPP_INTL::BaseSeverity::DEBUG, LPP_INTL::PolicyType::EVERY_N)
-#define DLOG_EVERY_T(severity, t) LPP_ASSERT_GLOG(LPP_INTL::GlogSeverity::severity); LPP_INTL::InternalPolicyLog<float>(LPP_GET_KEY(), t, LPP_INTL::BaseSeverity::DEBUG, LPP_INTL::PolicyType::TIMED)
+#define DLOG_EVERY_T(severity, t) LPP_WARN("DLOG_FIRST_N is a Log++ extension"); LPP_ASSERT_GLOG(LPP_INTL::GlogSeverity::severity); LPP_INTL::InternalPolicyLog<float>(LPP_GET_KEY(), t, LPP_INTL::BaseSeverity::DEBUG, LPP_INTL::PolicyType::TIMED)
 #define DLOG_FIRST_N(severity, n) LPP_WARN("DLOG_FIRST_N is a Log++ extension"); LPP_ASSERT_GLOG(LPP_INTL::GlogSeverity::severity); \
 LPP_INTL::InternalPolicyLog<int>(LPP_GET_KEY(), n, LPP_INTL::BaseSeverity::DEBUG, LPP_INTL::PolicyType::FIRST_N)
 #define DLOG_IF_EVERY_N(severity, condition, n) LPP_ASSERT_GLOG(LPP_INTL::GlogSeverity::severity); if (condition) LPP_INTL::InternalPolicyLog<int>(LPP_GET_KEY(), n, LPP_INTL::BaseSeverity::DEBUG, LPP_INTL::PolicyType::EVERY_N)