diff --git a/space_map_disk.h b/space_map_disk.h
index 7ea69ce..180056f 100644
--- a/space_map_disk.h
+++ b/space_map_disk.h
@@ -129,8 +129,8 @@ namespace persistent_data {
 				: tm_(tm),
 				  nr_blocks_(root.nr_blocks_),
 				  nr_allocated_(root.nr_allocated_),
-				  bitmaps_(tm_, root.bitmap_root_, typename sm_disk::index_entry_traits::ref_counter()),
-				  ref_counts_(tm_, root.ref_count_root_, typename ref_count_traits::ref_counter()) {
+				  bitmaps_(tm_, root.bitmap_root_, typename sm_disk_detail::index_entry_traits::ref_counter()),
+				  ref_counts_(tm_, root.ref_count_root_, ref_count_traits::ref_counter()) {
 			}
 
 			block_address get_nr_blocks() const {
diff --git a/space_map_disk_t.cc b/space_map_disk_t.cc
index ea8729f..6977a1e 100644
--- a/space_map_disk_t.cc
+++ b/space_map_disk_t.cc
@@ -119,4 +119,28 @@ BOOST_AUTO_TEST_CASE(test_set_effects_nr_allocated)
 	}
 }
 
+BOOST_AUTO_TEST_CASE(test_reopen)
+{
+	unsigned char buffer[128];
+
+	{
+		auto sm = create_sm_disk();
+		for (unsigned i = 0, step = 1; i < NR_BLOCKS; i += step, step++) {
+			sm->inc(i);
+		}
+
+		BOOST_CHECK(sm->root_size() <= sizeof(buffer));
+
+		sm->copy_root(buffer, sizeof(buffer));
+	}
+
+	{
+		auto tm = create_tm();
+		auto sm = persistent_data::open_disk_sm<BLOCK_SIZE>(tm, buffer);
+
+		for (unsigned i = 0, step = 1; i < NR_BLOCKS; i += step, step++)
+			BOOST_CHECK_EQUAL(sm->get_count(i), 1);
+	}
+}
+
 //----------------------------------------------------------------