diff --git a/lib/flow_control/uplink_downlink_splitter_impl.cc b/lib/flow_control/uplink_downlink_splitter_impl.cc
index b98102c..e98c668 100644
--- a/lib/flow_control/uplink_downlink_splitter_impl.cc
+++ b/lib/flow_control/uplink_downlink_splitter_impl.cc
@@ -27,6 +27,7 @@
 #include <gnuradio/io_signature.h>
 #include "uplink_downlink_splitter_impl.h"
 #include <grgsm/gsmtap.h>
+#include <grgsm/endian.h>
 #define BURST_SIZE 148
 namespace gr {
   namespace grgsm {