diff --git a/include/boost/phoenix/operator/arithmetic.hpp b/include/boost/phoenix/operator/arithmetic.hpp
index 03d2dcc..fda6277 100644
--- a/include/boost/phoenix/operator/arithmetic.hpp
+++ b/include/boost/phoenix/operator/arithmetic.hpp
@@ -42,6 +42,7 @@ namespace boost { namespace phoenix
     using proto::exprns_::operator-=;
     using proto::exprns_::operator*=;
     using proto::exprns_::operator/=;
+    using proto::exprns_::operator%=;
     using proto::exprns_::operator+;
     using proto::exprns_::operator-;
     using proto::exprns_::operator*;