diff --git a/include/boost/phoenix/scope/scoped_environment.hpp b/include/boost/phoenix/scope/scoped_environment.hpp
index 94e5bd3..5fcb245 100644
--- a/include/boost/phoenix/scope/scoped_environment.hpp
+++ b/include/boost/phoenix/scope/scoped_environment.hpp
@@ -35,13 +35,13 @@ namespace boost { namespace phoenix
         typedef Map map_type;
 
         scoped_environment(
-            Env const & env
-          , OuterEnv const &outer_env
-          , Locals const &locals
+            Env const & env_
+          , OuterEnv const &outer_env_
+          , Locals const &locals_
         )
-            : env(env)
-            , outer_env(outer_env)
-            , locals(locals)
+            : env(env_)
+            , outer_env(outer_env_)
+            , locals(locals_)
         {}
 
         scoped_environment(scoped_environment const & o)