diff --git a/.travis.yml b/.travis.yml
index 1a051b7120..64d27d8529 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -50,6 +50,7 @@ env:
     - LD_LIBRARY_PATH=$LUAJIT_LIB:$LD_LIBRARY_PATH
     - DRIZZLE_VER=2011.07.21
     - TEST_NGINX_SLEEP=0.006
+    - MALLOC_PERTURB_=9
   jobs:
     - NGINX_VERSION=1.21.4 OPENSSL_VER=1.1.0l OPENSSL_PATCH_VER=1.1.0d
     - NGINX_VERSION=1.21.4 OPENSSL_VER=1.1.1s OPENSSL_PATCH_VER=1.1.1f
diff --git a/src/ngx_http_lua_control.c b/src/ngx_http_lua_control.c
index 99460456c1..d7e427385d 100644
--- a/src/ngx_http_lua_control.c
+++ b/src/ngx_http_lua_control.c
@@ -280,6 +280,9 @@ ngx_http_lua_ngx_redirect(lua_State *L)
 
     h->value.len = len;
     h->value.data = uri;
+#if defined(nginx_version) && nginx_version >= 1023000
+    h->next = NULL;
+#endif
     ngx_str_set(&h->key, "Location");
 
     r->headers_out.status = rc;
diff --git a/src/ngx_http_lua_headers_in.c b/src/ngx_http_lua_headers_in.c
index 4405481408..960e2f85f6 100644
--- a/src/ngx_http_lua_headers_in.c
+++ b/src/ngx_http_lua_headers_in.c
@@ -280,6 +280,9 @@ ngx_http_set_header_helper(ngx_http_request_t *r, ngx_http_lua_header_val_t *hv,
 
     h->key = hv->key;
     h->value = *value;
+#if defined(nginx_version) && nginx_version >= 1023000
+    h->next = NULL;
+#endif
 
     h->lowcase_key = ngx_pnalloc(r->pool, h->key.len);
     if (h->lowcase_key == NULL) {
diff --git a/src/ngx_http_lua_headers_out.c b/src/ngx_http_lua_headers_out.c
index 571723d9a6..c51146a3fc 100644
--- a/src/ngx_http_lua_headers_out.c
+++ b/src/ngx_http_lua_headers_out.c
@@ -229,6 +229,9 @@ ngx_http_set_header_helper(ngx_http_request_t *r, ngx_http_lua_header_val_t *hv,
 
     h->key = hv->key;
     h->value = *value;
+#if defined(nginx_version) && nginx_version >= 1023000
+    h->next = NULL;
+#endif
 
     h->lowcase_key = ngx_pnalloc(r->pool, h->key.len);
     if (h->lowcase_key == NULL) {
diff --git a/src/ngx_http_lua_subrequest.c b/src/ngx_http_lua_subrequest.c
index f6638c2991..c09207417e 100644
--- a/src/ngx_http_lua_subrequest.c
+++ b/src/ngx_http_lua_subrequest.c
@@ -1667,6 +1667,9 @@ ngx_http_lua_copy_request_headers(ngx_http_request_t *sr,
 
         clh->hash = ngx_http_lua_content_length_hash;
         clh->key = ngx_http_lua_content_length_header_key;
+#if defined(nginx_version) && nginx_version >= 1023000
+        clh->next = NULL;
+#endif
         clh->lowcase_key = ngx_pnalloc(sr->pool, clh->key.len);
         if (clh->lowcase_key == NULL) {
             return NGX_ERROR;