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-rw-r--r--gr-trellis/lib/fsm.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gr-trellis/lib/fsm.cc b/gr-trellis/lib/fsm.cc
index e14a3fb08d..c4808cab44 100644
--- a/gr-trellis/lib/fsm.cc
+++ b/gr-trellis/lib/fsm.cc
@@ -11,6 +11,7 @@
#include <gnuradio/logger.h>
#include <gnuradio/trellis/base.h>
#include <gnuradio/trellis/fsm.h>
+#include <boost/format.hpp>
#include <cmath>
#include <cstdlib>
#include <fstream>