diff --git a/http_server.c b/http_server.c
index fea8b4eb..f0d8fcc6 100644
--- a/http_server.c
+++ b/http_server.c
@@ -304,7 +304,7 @@ static int _reserve_str(struct http_request *r, const char **resp, const char *s
 static void _mover_www_form_uri_decode(char *, const char *, size_t);
 static int _reserve_www_form_uriencoded(struct http_request *r, const char **resp, struct substring str)
 {
-  assert(str.end > str.start);
+  assert(str.end >= str.start);
   const char *after = NULL;
   size_t len = www_form_uri_decode(NULL, -1, (char *)str.start, str.end - str.start, &after);
   assert(len <= (size_t)(str.end - str.start)); // decoded must not be longer than encoded
diff --git a/tests/keyringrestful b/tests/keyringrestful
index d88f601b..8cb2f59a 100755
--- a/tests/keyringrestful
+++ b/tests/keyringrestful
@@ -137,7 +137,7 @@ test_keyringAdd() {
          --output add.json \
          --dump-header http.headers \
          --basic --user harry:potter \
-         "http://$addr_localhost:$PORTA/restful/keyring/add"
+         "http://$addr_localhost:$PORTA/restful/keyring/add?did="
    tfw_cat http.headers add.json
    tfw_preserve add.json
    assertStdoutIs '201'