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-rw-r--r--decoder/ff_source_syntax2.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/decoder/ff_source_syntax2.cc b/decoder/ff_source_syntax2.cc
index a97e31d8..48991920 100644
--- a/decoder/ff_source_syntax2.cc
+++ b/decoder/ff_source_syntax2.cc
@@ -3,6 +3,7 @@
#include <sstream>
#include <stack>
#include <string>
+#include <unordered_set>
#include "sentence_metadata.h"
#include "array2d.h"