1 files changed, 6 insertions, 2 deletions
diff --git a/extractor/rule_factory.h b/extractor/rule_factory.h
index 2d1c7f5a..0de04e40 100644
--- a/extractor/rule_factory.h
+++ b/extractor/rule_factory.h
@@ -5,15 +5,17 @@
 #include <vector>
 
 #include "matchings_trie.h"
-#include "phrase_builder.h"
 
 using namespace std;
 
+namespace extractor {
+
 class Alignment;
 class DataArray;
+class FastIntersector;
 class Grammar;
 class MatchingsFinder;
-class FastIntersector;
+class PhraseBuilder;
 class Precomputation;
 class Rule;
 class RuleExtractor;
@@ -92,4 +94,6 @@ class HieroCachingRuleFactory {
   int max_rule_symbols;
 };
 
+} // namespace extractor
+
 #endif