diff --git a/application/controllers/Restapi.php b/application/controllers/Restapi.php
index 4851df9..92b2169 100644
--- a/application/controllers/Restapi.php
+++ b/application/controllers/Restapi.php
@@ -152,7 +152,7 @@ public function runs_post() {
                 !isset($run['language_id']) ) {
             $this->error('runs_post: invalid run specification', 400);
         }
-        if (isset($run->sourcefilename) && !self::is_valid_source_filename($run->sourcefilename)) {
+        if (isset($run['sourcefilename']) && !self::is_valid_source_filename($run['sourcefilename'])) {
             $this->error('runs_post: invalid sourcefilename');
         }