--- thin-provisioning-tools-0.5.3/thin-provisioning/restore_emitter.cc	2016-05-10 16:36:40.000000000 -0400
+++ thin-provisioning-tools-0.5.3/thin-provisioning/restore_emitter.cc	2016-05-10 16:37:19.078584934 -0400
@@ -141,7 +141,7 @@ 
 		bool device_exists(thin_dev_t dev) const {
 			uint64_t key[1] = {dev};
 			device_tree::maybe_value v = md_->details_->lookup(key);
-			return v;
+			return (bool)v;
 		}
 
 		metadata::ptr md_;
--- thin-provisioning-tools-0.5.3/thin-provisioning/thin_pool.cc	2016-05-10 16:35:13.000000000 -0400
+++ thin-provisioning-tools-0.5.3/thin-provisioning/thin_pool.cc	2016-05-10 16:35:39.171391064 -0400
@@ -232,7 +232,7 @@ 
 thin_pool::device_exists(thin_dev_t dev) const
 {
 	uint64_t key[1] = {dev};
-	return md_->details_->lookup(key);
+	return (bool)md_->details_->lookup(key);
 }
 
 //----------------------------------------------------------------