diff --git a/backtrader_plotting/utils.py b/backtrader_plotting/utils.py
index 5bb5baf..7cc2591 100644
--- a/backtrader_plotting/utils.py
+++ b/backtrader_plotting/utils.py
@@ -24,7 +24,7 @@ def paramval2str(name, value):
     elif isinstance(value, float):
         return f"{value:.2f}"
     elif isinstance(value, (list,tuple)):
-        return ','.join(value)
+        return ','.join(map(str, value))
     elif isinstance(value, type):
         return value.__name__
     else: