diff --git a/dca-carouge-fountain/app.py b/dca-carouge-fountain/app.py
index 6885538d241d2e461cc606f79d304bd5f43cce53..3020c9b5aa8688fc1a1dd3ad3cde84029664a372 100755
--- a/dca-carouge-fountain/app.py
+++ b/dca-carouge-fountain/app.py
@@ -412,7 +412,7 @@ def _update_historical_db_from_local_raw_files():
 
         else:
             print("(!) WARNING device values are not what was expected in file {}, "
-                  "expected either 1 or 5 values from device, but got {}".format(json_file,len(values)))
+                  "expected either 1 or 5 values from device, but got {}".format(json_file, values))
             continue
 
         data.append(entity)