diff --git a/bundles/org.openhab.binding.mail/src/test/java/org/openhab/binding/mail/MailBuilderTest.java b/bundles/org.openhab.binding.mail/src/test/java/org/openhab/binding/mail/MailBuilderTest.java
index 1f5d31d06..7d7dfda4d 100644
--- a/bundles/org.openhab.binding.mail/src/test/java/org/openhab/binding/mail/MailBuilderTest.java
+++ b/bundles/org.openhab.binding.mail/src/test/java/org/openhab/binding/mail/MailBuilderTest.java
@@ -18,6 +18,7 @@ import static org.junit.jupiter.api.Assertions.*;
 
 import java.io.IOException;
 import java.net.MalformedURLException;
+import java.nio.file.Path;
 import java.util.Map;
 
 import javax.mail.MessagingException;
@@ -74,7 +75,8 @@ public class MailBuilderTest {
     public void withURLAttachmentReturnsMultiPartEmail()
             throws AddressException, EmailException, MalformedURLException {
         MailBuilder builder = new MailBuilder(TEST_EMAIL);
-        Email mail = builder.withText("boo").withURLAttachment("http://www.openhab.org").build();
+        String url = Path.of("src/test/resources/attachment.txt").toUri().toURL().toString();
+        Email mail = builder.withText("boo").withURLAttachment(url).build();
         assertThat(mail, instanceOf(MultiPartEmail.class));
     }
 
diff --git a/bundles/org.openhab.binding.mail/src/test/resources/attachment.txt b/bundles/org.openhab.binding.mail/src/test/resources/attachment.txt
new file mode 100644
index 000000000..dafe6b116
--- /dev/null
+++ b/bundles/org.openhab.binding.mail/src/test/resources/attachment.txt
@@ -0,0 +1 @@
+Lorem ipsum dolor sit amet, ut sed dolores repudiandae, no sit inani euripidis.