diff --git a/include/xo/gc/DX1Collector.hpp b/include/xo/gc/DX1Collector.hpp
index 40c69df..612092e 100644
--- a/include/xo/gc/DX1Collector.hpp
+++ b/include/xo/gc/DX1Collector.hpp
@@ -279,10 +279,12 @@ namespace xo {
              **/
             void forward_inplace(AGCObject * lhs_iface, void ** lhs_data);
 
+#ifdef OBSOLETE
             /** evacuate object with type @p iface at address @p from_src
              *  to to-space. Return new to-space location.
              **/
             void * _shallow_move(const AGCObject * iface, void * from_src);
+#endif
 
             /** true iff {alloc_hdr, object_data} should move for
              *  currently-running collection.
diff --git a/src/gc/DX1Collector.cpp b/src/gc/DX1Collector.cpp
index 2fa284e..b17185e 100644
--- a/src/gc/DX1Collector.cpp
+++ b/src/gc/DX1Collector.cpp
@@ -662,11 +662,13 @@ namespace xo {
             }
         }
 
+#ifdef OBSOLETE
         void *
         DX1Collector::_shallow_move(const AGCObject * iface, void * from_src)
         {
             return gco_store_._shallow_move(this, iface, from_src);
         }
+#endif
 
         bool
         DX1Collector::check_move_policy(header_type alloc_hdr,