diff --git a/src/core/ngx_inet.c b/src/core/ngx_inet.c
index a4e80ed8f..33b303dd0 100644
--- a/src/core/ngx_inet.c
+++ b/src/core/ngx_inet.c
@@ -348,7 +348,7 @@ ngx_inet6_ntop(u_char *p, u_char *text, size_t len)
             continue;
         }
 
-        dst = ngx_sprintf(dst, "%uxd", p[i] * 256 + p[i + 1]);
+        dst = ngx_sprintf(dst, "%xd", p[i] * 256 + p[i + 1]);
 
         if (i < 14) {
             *dst++ = ':';
diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 3c52de846..e00fe229a 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -1733,7 +1733,7 @@ ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n,
     trunc = flags & 0x0200;
 
     ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0,
-                   "resolver DNS response %ui fl:%04Xui %ui/%ui/%ud/%ud",
+                   "resolver DNS response %ui fl:%04Xi %ui/%ui/%ud/%ud",
                    ident, flags, nqs, nan,
                    (response->nns_hi << 8) + response->nns_lo,
                    (response->nar_hi << 8) + response->nar_lo);
@@ -1741,7 +1741,7 @@ ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n,
     /* response to a standard query */
     if ((flags & 0xf870) != 0x8000 || (trunc && tcp)) {
         ngx_log_error(r->log_level, r->log, 0,
-                      "invalid %s DNS response %ui fl:%04Xui",
+                      "invalid %s DNS response %ui fl:%04Xi",
                       tcp ? "TCP" : "UDP", ident, flags);
         return;
     }
diff --git a/src/event/modules/ngx_epoll_module.c b/src/event/modules/ngx_epoll_module.c
index 828e4d177..166c46166 100644
--- a/src/event/modules/ngx_epoll_module.c
+++ b/src/event/modules/ngx_epoll_module.c
@@ -910,7 +910,7 @@ ngx_epoll_eventfd_handler(ngx_event_t *ev)
             for (i = 0; i < events; i++) {
 
                 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, ev->log, 0,
-                               "io_event: %uXL %uXL %L %L",
+                               "io_event: %XL %XL %L %L",
                                 event[i].data, event[i].obj,
                                 event[i].res, event[i].res2);
 
diff --git a/src/os/win32/ngx_process.c b/src/os/win32/ngx_process.c
index 02e6c1a2d..57b1ae9f4 100644
--- a/src/os/win32/ngx_process.c
+++ b/src/os/win32/ngx_process.c
@@ -138,7 +138,7 @@ ngx_spawn_process(ngx_cycle_t *cycle, char *name, ngx_int_t respawn)
         }
 
         ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
-                      "%s process %P exited with code %Xul",
+                      "%s process %P exited with code %Xl",
                       name, pid, code);
 
         goto failed;
diff --git a/src/os/win32/ngx_process_cycle.c b/src/os/win32/ngx_process_cycle.c
index 3ebadbea6..795e41e57 100644
--- a/src/os/win32/ngx_process_cycle.c
+++ b/src/os/win32/ngx_process_cycle.c
@@ -484,7 +484,7 @@ ngx_reap_worker(ngx_cycle_t *cycle, HANDLE h)
         }
 
         ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
-                      "%s process %P exited with code %Xul",
+                      "%s process %P exited with code %Xl",
                       ngx_processes[n].name, ngx_processes[n].pid, code);
 
         ngx_close_handle(ngx_processes[n].reopen);