diff --git a/run.py b/run.py
index 8be9cfebaa1fae428c5de0cf42e674226e27a8ac..b9256c268722b5250dac604c8843340ced11dd75 100755
--- a/run.py
+++ b/run.py
@@ -102,6 +102,9 @@ def get_modes(running_config):
     if not modes:
         raise ValueError("yaml mast have config: mode")
 
+    if isinstance(modes, str):
+        modes = [modes]
+
     return modes