diff --git a/swig/grgsm_swig.i b/swig/grgsm_swig.i
index f823287..ff6ec5c 100644
--- a/swig/grgsm_swig.i
+++ b/swig/grgsm_swig.i
@@ -38,6 +38,7 @@
 #include "grgsm/misc_utils/message_file_source.h"
 #include "grgsm/misc_utils/msg_to_tag.h"
 #include "grgsm/misc_utils/controlled_fractional_resampler_cc.h"
+#include "grgsm/uplink_downlink_filter.h"
 %}
 
 %include "grgsm/receiver/receiver.h"
@@ -107,3 +108,5 @@
 GR_SWIG_BLOCK_MAGIC2(gsm, message_source);
 %include "grgsm/qa_utils/message_sink.h"
 GR_SWIG_BLOCK_MAGIC2(gsm, message_sink);
+%include "grgsm/uplink_downlink_filter.h"
+GR_SWIG_BLOCK_MAGIC2(grgsm, uplink_downlink_filter);