diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
index 3ec038a..e49d202 100644
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -1744,8 +1744,7 @@
     }
 
     if (r->headers_out.last_modified_time >= 0) {
-        p = ngx_pnalloc(r->pool,
-                   sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT") - 1);
+        p = ngx_pnalloc(r->pool, sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1);
         if (p == NULL) {
             return NGX_ERROR;
         }