diff --git a/compose/config/config.py b/compose/config/config.py
index be680503b..7a8e55331 100644
--- a/compose/config/config.py
+++ b/compose/config/config.py
@@ -84,6 +84,7 @@ DOCKER_CONFIG_KEYS = [
 ALLOWED_KEYS = DOCKER_CONFIG_KEYS + [
     'build',
     'container_name',
+    'depends_on',
     'dockerfile',
     'expose',
     'external_links',