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-rw-r--r--decoder/tree2string_translator.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/decoder/tree2string_translator.cc b/decoder/tree2string_translator.cc
index adc8dc89..bd3b01d0 100644
--- a/decoder/tree2string_translator.cc
+++ b/decoder/tree2string_translator.cc
@@ -2,6 +2,7 @@
#include <vector>
#include <queue>
#include <map>
+#include <unordered_map>
#include <unordered_set>
#include <boost/shared_ptr.hpp>
#include <boost/functional/hash.hpp>