diff --git a/phase/configure_k0s.go b/phase/configure_k0s.go
index b0e5b558..66f4d8be 100644
--- a/phase/configure_k0s.go
+++ b/phase/configure_k0s.go
@@ -138,7 +138,10 @@ func addUnlessExist(slice *[]string, s string) {
 
 func (p *ConfigureK0s) configFor(h *cluster.Host) (string, error) {
 	cfg := p.Config.Spec.K0s.Config.Dup()
-	defaults.Set(&cfg)
+	err := defaults.Set(&cfg)
+	if err != nil {
+		return "", err
+	}
 
 	var sans []string