diff --git a/tester/call_single_tester.c b/tester/call_single_tester.c
index 24782def2..47f8b32d2 100644
--- a/tester/call_single_tester.c
+++ b/tester/call_single_tester.c
@@ -3691,7 +3691,6 @@ static void call_with_fqdn_in_sdp(void) {
 	lp = linphone_core_get_config(pauline->lc);
 	lp_config_set_string(lp,"rtp","bind_address","localhost");
 
-
 	BC_ASSERT_TRUE(call_ok=call(marie,pauline));
 	if (!call_ok) goto end;
 	liblinphone_tester_check_rtcp(pauline,marie);
@@ -3734,8 +3733,8 @@ static void call_with_rtp_io_mode(void) {
 		/* The callee uses the RTP IO mode with the PCMU codec to send back audio to the caller. */
 		disable_all_audio_codecs_except_one(pauline->lc, "pcmu", -1);
 		lp_config_set_int(pauline->lc->config, "sound", "rtp_io", 1);
-		lp_config_set_string(pauline->lc->config, "sound", "rtp_local_addr", "localhost");
-		lp_config_set_string(pauline->lc->config, "sound", "rtp_remote_addr", "localhost");
+		lp_config_set_string(pauline->lc->config, "sound", "rtp_local_addr", "127.0.0.1");
+		lp_config_set_string(pauline->lc->config, "sound", "rtp_remote_addr", "127.0.0.1");
 		lp_config_set_int(pauline->lc->config, "sound", "rtp_local_port", 17076);
 		lp_config_set_int(pauline->lc->config, "sound", "rtp_remote_port", 17076);
 		lp_config_set_string(pauline->lc->config, "sound", "rtp_map", "pcmu/8000/1");