diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index ae3bb03..3970852 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -902,7 +902,8 @@
             }
         }
 
-        rc = ngx_http_parse_header_line(r, r->header_in);
+        rc = ngx_http_parse_header_line(r, r->header_in,
+                                        cscf->underscores_in_headers);
 
         if (rc == NGX_OK) {