diff --git a/apps/grgsm_trx b/apps/grgsm_trx
index d57c979..5c3dace 100755
--- a/apps/grgsm_trx
+++ b/apps/grgsm_trx
@@ -63,8 +63,8 @@
 		self.radio = radio_if(self.phy_args, self.phy_sample_rate,
 			self.phy_rx_gain, self.phy_tx_gain, self.phy_ppm,
 			self.phy_rx_antenna, self.phy_tx_antenna,
-			self.bind_addr, self.remote_addr,
-			self.base_port)
+			self.phy_freq_offset_hz, self.bind_addr,
+			self.remote_addr, self.base_port)
 
 		# Optional frequency offset
 		if self.phy_freq_offset_hz is not None:
diff --git a/python/trx/radio_if.py b/python/trx/radio_if.py
index f7f124f..11f1d40 100644
--- a/python/trx/radio_if.py
+++ b/python/trx/radio_if.py
@@ -86,8 +86,8 @@
 	def __init__(self, phy_args, phy_sample_rate,
 			phy_rx_gain, phy_tx_gain, phy_ppm,
 			phy_rx_antenna, phy_tx_antenna,
-			trx_bind_addr, trx_remote_addr,
-			trx_base_port):
+			phy_freq_offset_hz, trx_bind_addr,
+			trx_remote_addr, trx_base_port):
 
 		print("[i] Init Radio interface (L:%s:%u <-> R:%s:%u)"
 			% (trx_bind_addr, trx_base_port + 2,
@@ -98,6 +98,7 @@
 		self.rx_gain = phy_rx_gain
 		self.tx_gain = phy_tx_gain
 		self.ppm = phy_ppm
+		self.freq_offset_hz = phy_freq_offset_hz
 
 		gr.top_block.__init__(self, "GR-GSM TRX")