diff --git a/thin-provisioning/device_tree.cc b/thin-provisioning/device_tree.cc
index 223d816..4837cb7 100644
--- a/thin-provisioning/device_tree.cc
+++ b/thin-provisioning/device_tree.cc
@@ -47,6 +47,13 @@ namespace {
 
 namespace thin_provisioning {
 	namespace device_tree_detail {
+		device_details::device_details()
+			: mapped_blocks_(0),
+			  transaction_id_(0),
+			  creation_time_(0),
+			  snapshotted_time_(0) {
+		}
+
 		void
 		device_details_traits::unpack(device_details_disk const &disk, device_details &value)
 		{
diff --git a/thin-provisioning/device_tree.h b/thin-provisioning/device_tree.h
index 23ae924..ef32b45 100644
--- a/thin-provisioning/device_tree.h
+++ b/thin-provisioning/device_tree.h
@@ -20,6 +20,8 @@ namespace thin_provisioning {
 			uint64_t transaction_id_;  /* when created */
 			uint32_t creation_time_;
 			uint32_t snapshotted_time_;
+
+			device_details();
 		};
 
 		struct device_details_traits {