diff --git a/src/apps/relay/mainrelay.c b/src/apps/relay/mainrelay.c
index 9089b263..8df6a7ab 100644
--- a/src/apps/relay/mainrelay.c
+++ b/src/apps/relay/mainrelay.c
@@ -39,6 +39,8 @@
 
 static int use_lt_credentials = 0;
 static int anon_credentials = 0;
+static int use_lt_credentials_only = 0;
+static int timestamp_credentials = 0;
 
 ////// ALPN //////////
 
@@ -1162,6 +1164,7 @@ static void set_option(int c, char *value)
 		if (get_bool_value(value)) {
 			turn_params.ct = TURN_CREDENTIALS_LONG_TERM;
 			use_lt_credentials=1;
+            use_lt_credentials_only=1;
 		} else {
 			turn_params.ct = TURN_CREDENTIALS_UNDEFINED;
 			use_lt_credentials=0;
@@ -1223,12 +1226,14 @@ static void set_option(int c, char *value)
 #endif
 	case AUTH_SECRET_OPT:
 		turn_params.use_auth_secret_with_timestamp = 1;
+        timestamp_credentials = 1;
 		turn_params.ct = TURN_CREDENTIALS_LONG_TERM;
 		use_lt_credentials = 1;
 		break;
 	case STATIC_AUTH_SECRET_VAL_OPT:
 		add_to_secrets_list(&turn_params.default_users_db.ram_db.static_auth_secrets,value);
 		turn_params.use_auth_secret_with_timestamp = 1;
+        timestamp_credentials = 1;
 		turn_params.ct = TURN_CREDENTIALS_LONG_TERM;
 		use_lt_credentials = 1;
 		break;
@@ -1989,6 +1994,10 @@ int main(int argc, char **argv)
 		exit(-1);
 	}
 
+    if(use_lt_credentials_only && timestamp_credentials) {
+		TURN_LOG_FUNC(TURN_LOG_LEVEL_ERROR, "\nCONFIGURATION ALERT: you specified --lt-cred-mech and --use-auth-secret both. Check your configuration.\n");
+    }
+
 	if(!use_lt_credentials && !anon_credentials) {
 		if(turn_params.default_users_db.ram_db.users_number) {
 			TURN_LOG_FUNC(TURN_LOG_LEVEL_WARNING, "\nCONFIGURATION ALERT: you specified long-term user accounts, (-u option) \n	but you did not specify the long-term credentials option\n	(-a or --lt-cred-mech option).\n 	I am turning --lt-cred-mech ON for you, but double-check your configuration.\n");