--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -648,7 +648,7 @@ ngx_http_ssl_handshake(ngx_event_t *rev)
 
     err = ngx_socket_errno;
 
-    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, rev->log, 0, "http recv(): %d", n);
+    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, rev->log, 0, "http recv(): %z", n);
 
     if (n == -1) {
         if (err == NGX_EAGAIN) {
@@ -1500,7 +1500,7 @@ ngx_http_alloc_large_header_buffer(ngx_h
     }
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
-                   "http large header copy: %d", r->header_in->pos - old);
+                   "http large header copy: %uz", r->header_in->pos - old);
 
     new = b->start;
 
@@ -2264,7 +2264,7 @@ ngx_http_finalize_request(ngx_http_reque
     c = r->connection;
 
     ngx_log_debug5(NGX_LOG_DEBUG_HTTP, c->log, 0,
-                   "http finalize request: %d, \"%V?%V\" a:%d, c:%d",
+                   "http finalize request: %i, \"%V?%V\" a:%d, c:%d",
                    rc, &r->uri, &r->args, r == c->data, r->main->count);
 
     if (rc == NGX_DONE) {
@@ -2956,7 +2956,7 @@ ngx_http_set_keepalive(ngx_http_request_
         b->last = b->start;
     }
 
-    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, "hc free: %p %d",
+    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, "hc free: %p %i",
                    hc->free, hc->nfree);
 
     if (hc->free) {
@@ -2968,7 +2968,7 @@ ngx_http_set_keepalive(ngx_http_request_
         hc->nfree = 0;
     }
 
-    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, "hc busy: %p %d",
+    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, "hc busy: %p %i",
                    hc->busy, hc->nbusy);
 
     if (hc->busy) {
@@ -3259,7 +3259,7 @@ ngx_http_lingering_close_handler(ngx_eve
     do {
         n = c->recv(c, buffer, NGX_HTTP_LINGERING_BUFFER_SIZE);
 
-        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "lingering read: %d", n);
+        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "lingering read: %z", n);
 
         if (n == NGX_ERROR || n == 0) {
             ngx_http_close_request(r, 0);