diff --git a/swig/grgsm_swig.i b/swig/grgsm_swig.i
index a67e264..08d95f1 100644
--- a/swig/grgsm_swig.i
+++ b/swig/grgsm_swig.i
@@ -65,6 +65,7 @@
 #include "grgsm/misc_utils/msg_to_tag.h"
 #include "grgsm/misc_utils/controlled_fractional_resampler_cc.h"
 #include "grgsm/trx_interface/trx.h"
+#include "grgsm/misc_utils/fn_time.h"
 %}
 
 %include "constants.i"
@@ -146,3 +147,4 @@
 GR_SWIG_BLOCK_MAGIC2(gsm, message_sink);
 %include "grgsm/trx_interface/trx.h"
 GR_SWIG_BLOCK_MAGIC2(grgsm, trx);
+%include "grgsm/misc_utils/fn_time.h"