diff --git a/python/receiver/gsm_wideband_input.py b/python/receiver/gsm_wideband_input.py
index 9dee08d..5898e3d 100644
--- a/python/receiver/gsm_wideband_input.py
+++ b/python/receiver/gsm_wideband_input.py
@@ -45,7 +45,7 @@
         # Blocks
         ##################################################
         self.ppm_in = None
-        self.message_port_register_hier_out("ppm_in")
+        self.message_port_register_hier_in("ppm_in")
         #self.lpf = firdes.low_pass(1, samp_rate_out, 125e3, 5e3, firdes.WIN_HAMMING, 6.76)
         self.lpf = firdes.low_pass(1, samp_rate_in, 125e3, 75e3, firdes.WIN_HAMMING, 6.76)
         self.gsm_clock_offset_corrector_0 = grgsm.clock_offset_corrector(