diff --git a/grc/osmosdr_source_c.xml b/grc/osmosdr_source_c.xml
index e343e77..6c99874 100644
--- a/grc/osmosdr_source_c.xml
+++ b/grc/osmosdr_source_c.xml
@@ -3,6 +3,7 @@
OsmoSDR Source
osmosdr_source_c
OsmoSDR
+ 1
import osmosdr
osmosdr.source_c($args)
self.$(id).set_sample_rate($rate)