diff --git a/include/xo/gc/GCObjectStore.hpp b/include/xo/gc/GCObjectStore.hpp
index ab365a4..9e9c560 100644
--- a/include/xo/gc/GCObjectStore.hpp
+++ b/include/xo/gc/GCObjectStore.hpp
@@ -127,11 +127,10 @@ namespace xo {
 
              *  Require: runstate_.is_running()
              **/
-            void * _deep_move_root(DX1Collector * gc,
-                                   obj<AGCObject> from_src,
-                                   Generation upto);
+            void * deep_move_root(DX1Collector * gc,
+                                  obj<AGCObject> from_src,
+                                  Generation upto);
 
-        public:
             /** For each generation g in [0 ,.., upto)
              *  swap arenas assigned to {to-space, from-space}.
              *  Invoked once at the beginning of each gc cycle.
diff --git a/src/gc/DX1Collector.cpp b/src/gc/DX1Collector.cpp
index c4e754c..795cd2f 100644
--- a/src/gc/DX1Collector.cpp
+++ b/src/gc/DX1Collector.cpp
@@ -607,7 +607,7 @@ namespace xo {
                            xtag("slot.root()", slot.root()),
                            xtag("slot.root()->data_", slot.root()->data_));
 
-                void * root_to = gco_store_._deep_move_root(this, *slot.root(), upto);
+                void * root_to = gco_store_.deep_move_root(this, *slot.root(), upto);
 
                 slot.root()->reset_opaque(root_to);
 
diff --git a/src/gc/GCObjectStore.cpp b/src/gc/GCObjectStore.cpp
index c933faf..573af2e 100644
--- a/src/gc/GCObjectStore.cpp
+++ b/src/gc/GCObjectStore.cpp
@@ -707,9 +707,9 @@ namespace xo {
         }
 
         void *
-        GCObjectStore::_deep_move_root(DX1Collector * gc,
-                                       obj<AGCObject> from_src,
-                                       Generation upto)
+        GCObjectStore::deep_move_root(DX1Collector * gc,
+                                      obj<AGCObject> from_src,
+                                      Generation upto)
         {
             // NOTE:
             // Some roots are non-gc-owned nodes.