diff --git a/mail/common/src/main/java/com/fsck/k9/mail/CertificateValidationException.kt b/mail/common/src/main/java/com/fsck/k9/mail/CertificateValidationException.kt
index 36034512f..4255d2914 100644
--- a/mail/common/src/main/java/com/fsck/k9/mail/CertificateValidationException.kt
+++ b/mail/common/src/main/java/com/fsck/k9/mail/CertificateValidationException.kt
@@ -1,20 +1,8 @@
-package com.fsck.k9.mail;
+package com.fsck.k9.mail
 
-import java.security.cert.X509Certificate;
-import java.util.List;
+import java.security.cert.X509Certificate
 
-import org.jetbrains.annotations.NotNull;
-
-
-public class CertificateValidationException extends MessagingException {
-    private final List<X509Certificate> certificateChain;
-
-    public CertificateValidationException(@NotNull List<X509Certificate> certificateChain, Throwable cause) {
-        super(cause);
-        this.certificateChain = certificateChain;
-    }
-
-    public List<X509Certificate> getCertificateChain() {
-        return certificateChain;
-    }
-}
+class CertificateValidationException(
+    val certificateChain: List<X509Certificate>,
+    cause: Throwable?,
+) : MessagingException(cause)