diff --git a/cas/cas.go b/cas/cas.go
index 8f385fb2..b564c8d2 100644
--- a/cas/cas.go
+++ b/cas/cas.go
@@ -6,6 +6,9 @@ import (
 
 	"github.com/pkg/errors"
 	"github.com/smallstep/certificates/cas/apiv1"
+
+	// Enable default implementation
+	_ "github.com/smallstep/certificates/cas/softcas"
 )
 
 // CertificateAuthorityService is the interface implemented by all the CAS.