diff --git a/src/chameleon/template.py b/src/chameleon/template.py
index 7be56acd..6ebd81bc 100644
--- a/src/chameleon/template.py
+++ b/src/chameleon/template.py
@@ -119,7 +119,7 @@ class BaseTemplate:
     else:
         loader = MemoryLoader()
 
-    output_stream_factory: type[list[str]]
+    output_stream_factory: type[list]
     if DEBUG_MODE:
         output_stream_factory = DebuggingOutputStream
     else: