diff --git a/apps/grgsm_decode b/apps/grgsm_decode
index 8f412bf..89c03d3 100755
--- a/apps/grgsm_decode
+++ b/apps/grgsm_decode
@@ -124,7 +124,7 @@
             self.connect((self.file_source, 0), (self.input_adapter, 0))
             self.connect((self.input_adapter, 0), (self.receiver, 0))
             if self.fc is not None:
-                self.msg_connect(self.offset_control, "ppm", self.input_adapter, "ppm_in")
+                self.msg_connect(self.offset_control, "ctrl", self.input_adapter, "ctrl_in")
                 self.msg_connect(self.receiver, "measurements", self.offset_control, "measurements")
             self.msg_connect(self.receiver, "C0", self.dummy_burst_filter, "in")