diff --git a/htmlgen/generator.py b/htmlgen/generator.py
index 6d353b3..87d74d4 100644
--- a/htmlgen/generator.py
+++ b/htmlgen/generator.py
@@ -397,4 +397,4 @@ def generate(self):
 
 
 GenValue = Union[str, bytes, Generator]
-GenValueGenerator = GeneratorType[HTMLType, None, None]
+GenValueGenerator = GeneratorType[GenValue, None, None]