diff --git a/src/pyprintjson/pyprintjson.cpp b/src/pyprintjson/pyprintjson.cpp
index f49d4b41..1e107f31 100644
--- a/src/pyprintjson/pyprintjson.cpp
+++ b/src/pyprintjson/pyprintjson.cpp
@@ -21,7 +21,6 @@ namespace xo {
     namespace json {
         using xo::reflect::SelfTagging;
         using xo::reflect::TaggedRcptr;
-        using xo::ref::rp;
         using xo::ref::unowned_ptr;
 
         PYBIND11_MODULE(PYPRINTJSON_MODULE_NAME(), m) {