diff --git a/src/event/ngx_event_pipe.c b/src/event/ngx_event_pipe.c
index 62663d5a4..8ba247f4a 100644
--- a/src/event/ngx_event_pipe.c
+++ b/src/event/ngx_event_pipe.c
@@ -376,7 +376,7 @@ ngx_event_pipe_read_upstream(ngx_event_pipe_t *p)
         ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
                        "pipe buf busy s:%d t:%d f:%d "
                        "%p, pos %p, size: %z "
-                       "file: %O, size: %z",
+                       "file: %O, size: %O",
                        (cl->buf->shadow ? 1 : 0),
                        cl->buf->temporary, cl->buf->in_file,
                        cl->buf->start, cl->buf->pos,
@@ -389,7 +389,7 @@ ngx_event_pipe_read_upstream(ngx_event_pipe_t *p)
         ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
                        "pipe buf out  s:%d t:%d f:%d "
                        "%p, pos %p, size: %z "
-                       "file: %O, size: %z",
+                       "file: %O, size: %O",
                        (cl->buf->shadow ? 1 : 0),
                        cl->buf->temporary, cl->buf->in_file,
                        cl->buf->start, cl->buf->pos,
@@ -402,7 +402,7 @@ ngx_event_pipe_read_upstream(ngx_event_pipe_t *p)
         ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
                        "pipe buf in   s:%d t:%d f:%d "
                        "%p, pos %p, size: %z "
-                       "file: %O, size: %z",
+                       "file: %O, size: %O",
                        (cl->buf->shadow ? 1 : 0),
                        cl->buf->temporary, cl->buf->in_file,
                        cl->buf->start, cl->buf->pos,
@@ -415,7 +415,7 @@ ngx_event_pipe_read_upstream(ngx_event_pipe_t *p)
         ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
                        "pipe buf free s:%d t:%d f:%d "
                        "%p, pos %p, size: %z "
-                       "file: %O, size: %z",
+                       "file: %O, size: %O",
                        (cl->buf->shadow ? 1 : 0),
                        cl->buf->temporary, cl->buf->in_file,
                        cl->buf->start, cl->buf->pos,
diff --git a/src/http/ngx_http_request_body.c b/src/http/ngx_http_request_body.c
index bbf16fd25..0a07dfa18 100644
--- a/src/http/ngx_http_request_body.c
+++ b/src/http/ngx_http_request_body.c
@@ -936,7 +936,7 @@ ngx_http_request_body_chunked_filter(ngx_http_request_t *r, ngx_chain_t *in)
 
             ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
                            "http body chunked buf "
-                           "t:%d f:%d %p, pos %p, size: %z file: %O, size: %z",
+                           "t:%d f:%d %p, pos %p, size: %z file: %O, size: %O",
                            cl->buf->temporary, cl->buf->in_file,
                            cl->buf->start, cl->buf->pos,
                            cl->buf->last - cl->buf->pos,
@@ -1068,7 +1068,7 @@ ngx_http_request_body_save_filter(ngx_http_request_t *r, ngx_chain_t *in)
     for (cl = rb->bufs; cl; cl = cl->next) {
         ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
                        "http body old buf t:%d f:%d %p, pos %p, size: %z "
-                       "file: %O, size: %z",
+                       "file: %O, size: %O",
                        cl->buf->temporary, cl->buf->in_file,
                        cl->buf->start, cl->buf->pos,
                        cl->buf->last - cl->buf->pos,
@@ -1079,7 +1079,7 @@ ngx_http_request_body_save_filter(ngx_http_request_t *r, ngx_chain_t *in)
     for (cl = in; cl; cl = cl->next) {
         ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
                        "http body new buf t:%d f:%d %p, pos %p, size: %z "
-                       "file: %O, size: %z",
+                       "file: %O, size: %O",
                        cl->buf->temporary, cl->buf->in_file,
                        cl->buf->start, cl->buf->pos,
                        cl->buf->last - cl->buf->pos,
diff --git a/src/http/ngx_http_write_filter_module.c b/src/http/ngx_http_write_filter_module.c
index a2db53024..c16444099 100644
--- a/src/http/ngx_http_write_filter_module.c
+++ b/src/http/ngx_http_write_filter_module.c
@@ -73,7 +73,7 @@ ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
 
         ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0,
                        "write old buf t:%d f:%d %p, pos %p, size: %z "
-                       "file: %O, size: %z",
+                       "file: %O, size: %O",
                        cl->buf->temporary, cl->buf->in_file,
                        cl->buf->start, cl->buf->pos,
                        cl->buf->last - cl->buf->pos,
@@ -129,7 +129,7 @@ ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
 
         ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0,
                        "write new buf t:%d f:%d %p, pos %p, size: %z "
-                       "file: %O, size: %z",
+                       "file: %O, size: %O",
                        cl->buf->temporary, cl->buf->in_file,
                        cl->buf->start, cl->buf->pos,
                        cl->buf->last - cl->buf->pos,