diff --git a/python/trx/radio_if.py b/python/trx/radio_if.py
index 0d844c0..acbc3cd 100644
--- a/python/trx/radio_if.py
+++ b/python/trx/radio_if.py
@@ -38,7 +38,7 @@
 from gnuradio import filter
 from gnuradio.filter import firdes
 
-from dict_toggle_sign import dict_toggle_sign
+from .dict_toggle_sign import dict_toggle_sign
 
 class RadioInterface(gr.top_block):
 	# PHY specific variables