1 files changed, 6 insertions, 2 deletions
diff --git a/extractor/rule_extractor.h b/extractor/rule_extractor.h
index a087dc6d..8b6daeea 100644
--- a/extractor/rule_extractor.h
+++ b/extractor/rule_extractor.h
@@ -9,6 +9,10 @@
 
 using namespace std;
 
+namespace extractor {
+
+typedef vector<pair<int, int> > PhraseAlignment;
+
 class Alignment;
 class DataArray;
 class PhraseBuilder;
@@ -18,8 +22,6 @@ class RuleExtractorHelper;
 class Scorer;
 class TargetPhraseExtractor;
 
-typedef vector<pair<int, int> > PhraseAlignment;
-
 struct Extract {
   Extract(const Phrase& source_phrase, const Phrase& target_phrase,
           double pairs_count, const PhraseAlignment& alignment) :
@@ -101,4 +103,6 @@ class RuleExtractor {
   bool require_tight_phrases;
 };
 
+} // namespace extractor
+
 #endif