--- a/src/common/unordered_defs.h
+++ b/src/common/unordered_defs.h
@@ -4,18 +4,16 @@
#ifdef HAVE_CXX0X_UNORDERED
# include <unordered_map>
# include <unordered_set>
-using std::tr1::unordered_map;
-using std::tr1::unordered_set;
-#define STD_UNORDERED_MAP std::unordered_map
-#define STD_UNORDERED_SET std::unordered_set
+# define STD_UNORDERED_MAP std::unordered_map
+# define STD_UNORDERED_SET std::unordered_set
#elif defined(HAVE_TR1_UNORDERED)
# include <tr1/unordered_map>
# include <tr1/unordered_set>
-#define STD_UNORDERED_MAP std::tr1::unordered_map
-#define STD_UNORDERED_SET std::tr1::unordered_set
+# define STD_UNORDERED_MAP std::tr1::unordered_map
+# define STD_UNORDERED_SET std::tr1::unordered_set
#else
# include <map>
# include <set>
-#define STD_UNORDERED_MAP std::map
-#define STD_UNORDERED_SET std::set
+# define STD_UNORDERED_MAP std::map
+# define STD_UNORDERED_SET std::set
#endif