--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -956,11 +956,44 @@ static ngx_int_t
 ngx_http_variable_server_port(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data)
 {
-    v->len = r->port_text->len - 1;
+    ngx_uint_t            port;
+    struct sockaddr_in   *sin;
+#if (NGX_HAVE_INET6)
+    struct sockaddr_in6  *sin6;
+#endif
+
+    v->len = 0;
     v->valid = 1;
     v->no_cacheable = 0;
     v->not_found = 0;
-    v->data = r->port_text->data + 1;
+
+    if (ngx_http_server_addr(r, NULL) != NGX_OK) {
+        return NGX_ERROR;
+    }
+
+    v->data = ngx_pnalloc(r->pool, sizeof("65535") - 1);
+    if (v->data == NULL) {
+        return NGX_ERROR;
+    }
+
+    switch (r->connection->local_sockaddr->sa_family) {
+
+#if (NGX_HAVE_INET6)
+    case AF_INET6:
+        sin6 = (struct sockaddr_in6 *) r->connection->local_sockaddr;
+        port = ntohs(sin6->sin6_port);
+        break;
+#endif
+
+    default: /* AF_INET */
+        sin = (struct sockaddr_in *) r->connection->local_sockaddr;
+        port = ntohs(sin->sin_port);
+        break;
+    }
+
+    if (port > 0 && port < 65536) {
+        v->len = ngx_sprintf(v->data, "%ui", port) - v->data;
+    }
 
     return NGX_OK;
 }