diff --git a/include/xo/gc/detail/ICollector_DX1Collector.hpp b/include/xo/gc/detail/ICollector_DX1Collector.hpp
index 02c0902..fe7bb01 100644
--- a/include/xo/gc/detail/ICollector_DX1Collector.hpp
+++ b/include/xo/gc/detail/ICollector_DX1Collector.hpp
@@ -44,6 +44,7 @@ namespace xo {
             static size_type reserved(const DX1Collector & d, Generation g, role r);
             static size_type committed(const DX1Collector & d, Generation g, role r);
             static bool is_type_installed(const DX1Collector & d, typeseq tseq);
+            static bool contains(const DX1Collector & d, role r, const void * addr);
 
             static bool install_type(DX1Collector & d, const AGCObject & iface);
             static void add_gc_root_poly(DX1Collector & d, obj<AGCObject> * p_root);
diff --git a/src/gc/ICollector_DX1Collector.cpp b/src/gc/ICollector_DX1Collector.cpp
index 09ec8ba..5503d42 100644
--- a/src/gc/ICollector_DX1Collector.cpp
+++ b/src/gc/ICollector_DX1Collector.cpp
@@ -47,6 +47,12 @@ namespace xo {
             return stat_helper(d, &DArena::committed, g, r);
         }
 
+        bool
+        ICollector_DX1Collector::contains(const DX1Collector & d, role r, const void * addr)
+        {
+            return d.contains(r, addr);
+        }
+
         bool
         ICollector_DX1Collector::is_type_installed(const DX1Collector & d, typeseq tseq)
         {