diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 0c7dd3f..28f7d99 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1088,6 +1088,7 @@
 ngx_http_core_access_phase(ngx_http_request_t *r, ngx_http_phase_handler_t *ph)
 {
     ngx_int_t                  rc;
+    ngx_table_elt_t           *h;
     ngx_http_core_loc_conf_t  *clcf;
 
     if (r != r->main) {
@@ -1122,8 +1123,8 @@
         if (rc == NGX_OK) {
             r->access_code = 0;
 
-            if (r->headers_out.www_authenticate) {
-                r->headers_out.www_authenticate->hash = 0;
+            for (h = r->headers_out.www_authenticate; h; h = h->next) {
+                h->hash = 0;
             }
 
             r->phase_handler = ph->next;