diff --git a/run.py b/run.py
index 47f2954..203a2b6 100644
--- a/run.py
+++ b/run.py
@@ -161,8 +161,7 @@ def run_script(script):
     path=%s
     out_path=%s
     task=%s
-    mkdir $out_path
-    mkdir $out_path/masks
+    mkdir -p $out_path/masks
     sub_IDs="%s"
     sess=%s
     for subjects in ${sub_IDs}; do