diff --git a/grc/gen_osmosdr_blocks.py b/grc/gen_osmosdr_blocks.py
index 2e496d6..00a10b2 100644
--- a/grc/gen_osmosdr_blocks.py
+++ b/grc/gen_osmosdr_blocks.py
@@ -176,8 +176,8 @@ PARAMS_TMPL = """
Ch$(n): Gain Mode
gain_mode$(n)
-
- enum
+ 0
+ int
\#if \$nchan() > $n then 'none' else 'all'#