diff --git a/e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/model/EmailAttachment.kt b/e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/model/EmailAttachment.kt
index e21169e..f292aac 100644
--- a/e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/model/EmailAttachment.kt
+++ b/e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/model/EmailAttachment.kt
@@ -4,8 +4,8 @@ import net.codinux.invoicing.model.Invoice
 import java.io.File
 
 class EmailAttachment(
-    val filename: String?,
-    val extension: String?,
+    val filename: String,
+    val extension: String,
     val size: Int?,
     val disposition: ContentDisposition,
     /**