diff --git a/cassandane-redirect-syslog.c b/cassandane-redirect-syslog.c
deleted file mode 100644
index 37ad53e..0000000
--- a/cassandane-redirect-syslog.c
+++ /dev/null
@@ -1,17 +0,0 @@
-/* This is used to build an LD_PRELOAD library to redirect syslog calls. */
-
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-void openlog(const char *ident, int option, int facility) { return; }
-void closelog(void) { return; }
-
-void syslog(int priority, const char *format, ...) {
-    va_list va;
-    va_start(va, format);
-    vfprintf(stderr, format, va);
-    va_end(va);
-}
-
-
diff --git a/cyrus-imapd.spec b/cyrus-imapd.spec
index 2c2422d..73e1c32 100644
--- a/cyrus-imapd.spec
+++ b/cyrus-imapd.spec
@@ -1,8 +1,8 @@
 %define scmt(l:) %(c=%1; echo ${c:0:%{-l:%{-l*}}%{!-l:7}})
 
-# Cassandane doesn't have releases often, but it receives constant development.
-# This was fetched on 20170622
-%global cmt1 6d33978ebb0055be41a5cb8e52958e100401bf26
+# Cassandane commit hash.  Cassandane doesn't have releases often, but it
+# receives constant development.  This was fetched on 20170622.
+%global cocas 6d33978ebb0055be41a5cb8e52958e100401bf26
 
 # Cassandane run by default.  '--without cassandane' disables.
 %bcond_without cassandane
@@ -56,7 +56,7 @@ Source18: cyrus-imapd-init.service
 Source19: cyrus-imapd.tmpfiles.conf
 
 # Source files for running the Cassandane test suite at build time.
-Source80: https://github.com/cyrusimap/cassandane/archive/%cmt1.tar.gz#/cassandane-%{scmt %cmt1}.tar.gz
+Source80: https://github.com/cyrusimap/cassandane/archive/%cocas.tar.gz#/cassandane-%{scmt %cocas}.tar.gz
 
 # The CPAN version, and hence the Fedora-packaged version, of Net::CalDAVTalk
 # doesn't include the testdata directory.  Cassandane can use it for testing
@@ -69,10 +69,6 @@ Source81: cassandane-testdata-20170523.tar.gz
 # A template config file for cassandane; we will substitute in varions values.
 Source82: cassandane.ini
 
-# Basically everything in the test suite wants to use syslog.  That's not so
-# easy in mock, so here's an LD_PRELOAD to redirect syslog calls to stderr.
-Source83: cassandane-redirect-syslog.c
-
 # These are source files and not patches because you can't use autosetup to
 # apply patches to secondary unpacked source files.
 
@@ -216,7 +212,7 @@ install -m 644 %SOURCE16 doc/
 
 # Unpack and prepare cassandane
 tar xf %SOURCE80
-ln -s cassandane-%cmt1 cassandane
+ln -s cassandane-%cocas cassandane
 pushd cassandane
 mkdir work
 tar xf %SOURCE81
@@ -230,7 +226,6 @@ sed -i \
     -e "s!BUILDROOT!%buildroot!" \
     cassandane.ini
 
-cp %SOURCE83 redirect-syslog.c
 popd
 
 %build
@@ -450,23 +445,28 @@ export CYRUS_USER=$USER
 
 # Construct the set of excluded tests to pass to Cassandane
 # ---------------------------------------------------------
-# Note that Cassandane::Test::Core must always be excluded; it can't possibly
-# work.
-# Upstream says that the Metronome tests won't be reliable on shared hardware
-# and are more for testing system performance than for testing Cyrus itself.
-exclude=('!Cassandane::Test::Core' '!Metronome')
-
-# The following tests fail on all architectures.
+exclude=()
 tests=(
+    # This is more a test of system performance and according to upstream won't
+    # be reliable on shared hardware like our builders.
+    Metronome
+
+    # This tests coredumping and won't work on a machine where systemd
+    # intercepts coredumps.
+    Cassandane::Test::Core
+
     # Fails because our Xapian is too old for proper CJK support.  1.5 will be
     # OK, but it is not yet released.  The alternative is to bundle.
     SearchFuzzy.cjk_words
 
+    # Needs a patch to libical, which should be in 2.1/3.0 when it releases.
+    # The alternative is to bundle.
+    # https://github.com/cyrusimap/cyrus-imapd/issues/2048
+    JMAPCalendars.setcalendarevents_alerts
+
+    # As of yet unexplained
     # https://github.com/cyrusimap/cyrus-imapd/issues/2047
     Admin.imap_admins
-
-    # https://github.com/cyrusimap/cyrus-imapd/issues/2048
-   JMAPCalendars.setcalendarevents_alerts
 )
 for i in ${tests[@]}; do exclude+=("!$i"); done