diff --git a/pkg/internal/venafi/api/api.go b/pkg/internal/venafi/api/api.go
index cc574494f..e2e44c661 100644
--- a/pkg/internal/venafi/api/api.go
+++ b/pkg/internal/venafi/api/api.go
@@ -16,13 +16,15 @@ limitations under the License.
 
 package api
 
-import (
-	"github.com/Venafi/vcert/pkg/certificate"
+type CustomFieldType string
+
+const (
+	CustomFieldTypePlain CustomFieldType = "Plain"
 )
 
 // CustomField defines a custom field to be passed to Venafi
 type CustomField struct {
-	Type  certificate.CustomFieldType `json:"type,omitempty"`
-	Name  string                      `json:"name"`
-	Value string                      `json:"value"`
+	Type  CustomFieldType `json:"type,omitempty"`
+	Name  string          `json:"name"`
+	Value string          `json:"value"`
 }
diff --git a/pkg/internal/venafi/sign.go b/pkg/internal/venafi/sign.go
index abd19b1a8..dd8152825 100644
--- a/pkg/internal/venafi/sign.go
+++ b/pkg/internal/venafi/sign.go
@@ -52,7 +52,20 @@ func (v *Venafi) Sign(csrPEM []byte, duration time.Duration, customFields []inte
 	if len(customFields) > 0 {
 		vreq.CustomFields = []certificate.CustomField{}
 		for _, field := range customFields {
-			vreq.CustomFields = append(vreq.CustomFields, certificate.CustomField(field))
+			var fieldType certificate.CustomFieldType
+			switch field.Type {
+			case internalvanafiapi.CustomFieldTypePlain:
+				fieldType = certificate.CustomFieldPlain
+				break
+			default:
+				fieldType = certificate.CustomFieldPlain
+			}
+
+			vreq.CustomFields = append(vreq.CustomFields, certificate.CustomField{
+				Type:  fieldType,
+				Name:  field.Name,
+				Value: field.Value,
+			})
 		}
 	}