diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 7fab50abc..645738ce5 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -3062,7 +3062,7 @@ ngx_udp_connect(ngx_udp_connection_t *uc)
 #endif
 
     ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0,
-                   "connect to %V, fd:%d #%d", &uc->server, s, c->number);
+                   "connect to %V, fd:%d #%uA", &uc->server, s, c->number);
 
     rc = connect(s, uc->sockaddr, uc->socklen);
 
diff --git a/src/event/ngx_event_accept.c b/src/event/ngx_event_accept.c
index e33dce81e..bf67ecee0 100644
--- a/src/event/ngx_event_accept.c
+++ b/src/event/ngx_event_accept.c
@@ -344,7 +344,7 @@ ngx_event_accept(ngx_event_t *ev)
 #endif
 
         ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
-                       "*%d accept: %V fd:%d", c->number, &c->addr_text, s);
+                       "*%uA accept: %V fd:%d", c->number, &c->addr_text, s);
 
         if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
             if (ngx_add_conn(c) == NGX_ERROR) {
diff --git a/src/event/ngx_event_connect.c b/src/event/ngx_event_connect.c
index fddad0a92..5fcabcfd1 100644
--- a/src/event/ngx_event_connect.c
+++ b/src/event/ngx_event_connect.c
@@ -122,7 +122,7 @@ ngx_event_connect_peer(ngx_peer_connection_t *pc)
     }
 
     ngx_log_debug3(NGX_LOG_DEBUG_EVENT, pc->log, 0,
-                   "connect to %V, fd:%d #%d", pc->name, s, c->number);
+                   "connect to %V, fd:%d #%uA", pc->name, s, c->number);
 
     rc = connect(s, pc->sockaddr, pc->socklen);
 
diff --git a/src/mail/ngx_mail_handler.c b/src/mail/ngx_mail_handler.c
index 7cfff1a07..9212a121c 100644
--- a/src/mail/ngx_mail_handler.c
+++ b/src/mail/ngx_mail_handler.c
@@ -127,7 +127,7 @@ ngx_mail_init_connection(ngx_connection_t *c)
     c->data = s;
     s->connection = c;
 
-    ngx_log_error(NGX_LOG_INFO, c->log, 0, "*%ui client %V connected to %V",
+    ngx_log_error(NGX_LOG_INFO, c->log, 0, "*%uA client %V connected to %V",
                   c->number, &c->addr_text, s->addr_text);
 
     ctx = ngx_palloc(c->pool, sizeof(ngx_mail_log_ctx_t));