diff --git a/gnu/packages/kde-frameworks.scm b/gnu/packages/kde-frameworks.scm
index fb578ee7e1..ae0e7f894d 100644
--- a/gnu/packages/kde-frameworks.scm
+++ b/gnu/packages/kde-frameworks.scm
@@ -2722,9 +2722,12 @@ (define-public kio
                (setenv "QT_QPA_PLATFORM" "offscreen")
                (setenv "DBUS_FATAL_WARNINGS" "0")
                (invoke "dbus-launch" "ctest"
-                       "-E" ; FIXME: 17/69 tests fail.
+                       "-E"
+                       ;; The following tests fail or are flaky (see:
+                       ;; https://bugs.kde.org/show_bug.cgi?id=440721).
                        (string-append "(kiocore-jobtest"
                                       "|kiocore-kmountpointtest"
+                                      "|kiowidgets-kdirlistertest"
                                       "|kiocore-kfileitemtest"
                                       "|kiocore-ktcpsockettest"
                                       "|kiocore-mimetypefinderjobtest"