diff --git a/circle.yml b/circle.yml
index 4eae4127a7..9c6d84e4af 100644
--- a/circle.yml
+++ b/circle.yml
@@ -4,7 +4,7 @@ machine:
 
 checkout:
   post:
-    - git submodule sync
+    - git submodule sync --recursive
     - git submodule update --init --recursive
 
 ## Customize dependencies