diff --git a/src/mod/endpoints/mod_sofia/sofia.c b/src/mod/endpoints/mod_sofia/sofia.c
index b1a0da0d92..36e490b359 100644
--- a/src/mod/endpoints/mod_sofia/sofia.c
+++ b/src/mod/endpoints/mod_sofia/sofia.c
@@ -4000,32 +4000,32 @@ void sofia_handle_sip_i_info(nua_t *nua, sofia_profile_t *profile, nua_handle_t
 
 		if (sip->sip_from && sip->sip_from->a_url) {
 			if (sip->sip_from->a_url->url_user) {
-				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-From-User", sip->sip_from->a_url->url_user);
+				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-From-User", "%s", sip->sip_from->a_url->url_user);
 			}
 
 			if (sip->sip_from->a_url->url_host) {
-				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-From-Host", sip->sip_from->a_url->url_host);
+				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-From-Host", "%s", sip->sip_from->a_url->url_host);
 			}
 		}
 
 		if (sip->sip_to && sip->sip_to->a_url) {
 			if (sip->sip_to->a_url->url_user) {
-				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-To-User", sip->sip_to->a_url->url_user);
+				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-To-User", "%s", sip->sip_to->a_url->url_user);
 			}
 
 			if (sip->sip_to->a_url->url_host) {
-				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-To-Host", sip->sip_to->a_url->url_host);
+				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-To-Host", "%s", sip->sip_to->a_url->url_host);
 			}
 		}
 
 
 		if (sip->sip_contact && sip->sip_contact->m_url) {
 			if (sip->sip_contact->m_url->url_user) {
-				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-Contact-User", sip->sip_contact->m_url->url_user);
+				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-Contact-User", "%s", sip->sip_contact->m_url->url_user);
 			}
 
 			if (sip->sip_contact->m_url->url_host) {
-				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-Contact-Host", sip->sip_contact->m_url->url_host);
+				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "SIP-Contact-Host", "%s", sip->sip_contact->m_url->url_host);
 			}
 		}