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-rw-r--r--decoder/grammar.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/decoder/grammar.cc b/decoder/grammar.cc
index 714390f0..d1fe53af 100644
--- a/decoder/grammar.cc
+++ b/decoder/grammar.cc
@@ -4,6 +4,7 @@
#include <utility>
#include <map>
#include <tr1/unordered_map>
+#include <tr1/unordered_set>
#include "rule_lexer.h"
#include "filelib.h"