diff --git a/include/xo/gc/DX1Collector.hpp b/include/xo/gc/DX1Collector.hpp
index 85b0c18..6eb4e3a 100644
--- a/include/xo/gc/DX1Collector.hpp
+++ b/include/xo/gc/DX1Collector.hpp
@@ -279,12 +279,14 @@ namespace xo {
              **/
             void forward_inplace(AGCObject * lhs_iface, void ** lhs_data);
 
+#ifdef OBSOLETE
             /** true iff {alloc_hdr, object_data} should move for
              *  currently-running collection.
              *
              *  Require: runstate_.is_running()
              **/
             bool check_move_policy(header_type alloc_hdr, void * object_data) const noexcept;
+#endif
 
             // ----- allocation -----
 
diff --git a/src/gc/DX1Collector.cpp b/src/gc/DX1Collector.cpp
index 4dd9a1e..baa775b 100644
--- a/src/gc/DX1Collector.cpp
+++ b/src/gc/DX1Collector.cpp
@@ -662,6 +662,7 @@ namespace xo {
             }
         }
 
+#ifdef OBSOLETE
         bool
         DX1Collector::check_move_policy(header_type alloc_hdr,
                                         void * object_data) const noexcept
@@ -672,6 +673,7 @@ namespace xo {
                                                  object_data,
                                                  runstate_.gc_upto());
         }
+#endif
 
         auto
         DX1Collector::alloc(typeseq t, size_type z) noexcept -> value_type