diff --git a/src/mod/applications/mod_conference/mod_conference.c b/src/mod/applications/mod_conference/mod_conference.c
index c85e6b6ef0..c0cbc51d20 100644
--- a/src/mod/applications/mod_conference/mod_conference.c
+++ b/src/mod/applications/mod_conference/mod_conference.c
@@ -3412,7 +3412,7 @@ static switch_status_t conf_api_sub_volume_in(conference_member_t *member, switc
 		data && switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, CONF_EVENT_MAINT) == SWITCH_STATUS_SUCCESS) {
 		conference_add_event_member_data(member, event);
 		switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Action", "volume-in-member");
-		switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Volume-Level", "%u", member->volume_in_level);
+		switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Volume-Level", "%d", member->volume_in_level);
 		switch_event_fire(&event);
 	}
 
@@ -3439,7 +3439,7 @@ static switch_status_t conf_api_sub_volume_out(conference_member_t *member, swit
 		switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, CONF_EVENT_MAINT) == SWITCH_STATUS_SUCCESS) {
 		conference_add_event_member_data(member, event);
 		switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Action", "volume-out-member");
-		switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Volume-Level", "%u", member->volume_out_level);
+		switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Volume-Level", "%d", member->volume_out_level);
 		switch_event_fire(&event);
 	}