diff --git a/lib/backend/shadowbackend/client.go b/lib/backend/shadowbackend/client.go
index b9ca0bff..7e8cbb5a 100644
--- a/lib/backend/shadowbackend/client.go
+++ b/lib/backend/shadowbackend/client.go
@@ -30,10 +30,16 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
+const _shadow = "shadow"
+
+func init() {
+	backend.Register(_shadow, &factory{})
+}
+
 type factory struct{}
 
 func (f *factory) Name() string {
-	return "shadow"
+	return _shadow
 }
 
 func (f *factory) Create(
diff --git a/lib/backend/sqlbackend/client.go b/lib/backend/sqlbackend/client.go
index c9f18ea7..aadf0346 100644
--- a/lib/backend/sqlbackend/client.go
+++ b/lib/backend/sqlbackend/client.go
@@ -33,6 +33,10 @@ import (
 
 const _sql = "sql"
 
+func init() {
+	backend.Register(_sql, &factory{})
+}
+
 type factory struct{}
 
 func (f *factory) Name() string {