diff --git a/Makefile b/Makefile
index 6ac24d6..40c7928 100644
--- a/Makefile
+++ b/Makefile
@@ -56,6 +56,7 @@ INSPIRCD_SELECTORS := \
 # testQuit and testQuitErrors fail because ircu2 does not send ERROR or QUIT
 # lusers tests fail because they depend on Modern behavior, not just RFC2812 (TODO: update lusers tests to accept RFC2812-compliant implementations)
 # statusmsg tests fail because STATUSMSG is present in ISUPPORT, but it not actually supported as PRIVMSG target
+# testKeyValidation[empty] fails because ircu2 returns ERR_NEEDMOREPARAMS on empty keys: https://github.com/UndernetIRC/ircu2/issues/13
 IRCU2_SELECTORS := \
 	not Ergo \
 	and not deprecated \
@@ -64,6 +65,7 @@ IRCU2_SELECTORS := \
 	and not testQuit \
 	and not lusers \
 	and not statusmsg \
+	and not (testKeyValidation and empty) \
 	$(EXTRA_SELECTORS)
 
 # same justification as ircu2
diff --git a/irctest/server_tests/mode.py b/irctest/server_tests/mode.py
index 0361bc7..0912be6 100644
--- a/irctest/server_tests/mode.py
+++ b/irctest/server_tests/mode.py
@@ -46,7 +46,11 @@ class KeyTestCase(cases.BaseServerTestCase):
         reply = self.getMessages(2)
         self.assertMessageMatch(reply[0], command="JOIN", params=["#chan"])
 
-    @pytest.mark.parametrize("key", ["passphrase with spaces", "long" * 100, ""])
+    @pytest.mark.parametrize(
+        "key",
+        ["passphrase with spaces", "long" * 100, ""],
+        ids=["spaces", "long", "empty"],
+    )
     @cases.mark_specifications("RFC2812", "Modern")
     def testKeyValidation(self, key):
         """