diff --git a/src/exchange/taler-exchange-httpd_parsing.c b/src/exchange/taler-exchange-httpd_parsing.c
index beac81a1c..c97ea05b8 100644
--- a/src/exchange/taler-exchange-httpd_parsing.c
+++ b/src/exchange/taler-exchange-httpd_parsing.c
@@ -239,6 +239,7 @@ TMH_PARSE_json_array (struct MHD_Connection *connection,
     dim++;
     root = json_array_get (root, ret);
   }
+  va_end (ap);
   if (NULL == root)
   {
     ret = (MHD_YES ==