diff --git a/src/auth.c b/src/auth.c
index badc780d..1435bda2 100644
--- a/src/auth.c
+++ b/src/auth.c
@@ -73,7 +73,7 @@ int auth_verify_password_krb5(LOGBOOK * lbs, const char *user, const char *passw
    krb5_free_context(context);
 
    if (error && error != KRB5KDC_ERR_PREAUTH_FAILED && error != KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN) {
-      strlcpy(error_str, "<b>Kerberos error:</b><br>", error_size);
+      sprintf(error_str, "<b>Kerberos error %d:</b><br>", error_size, error);
       strlcat(error_str, krb5_get_error_message(context, error), error_size);
       strlcat(error_str, ".<br>Please check your Kerberos configuration.", error_size);
       return FALSE;