diff --git a/tests/assets/mail/roundcube/carddav_refresh.sh b/tests/assets/mail/roundcube/carddav_refresh.sh
index 16f927ee..c26a1f4e 100755
--- a/tests/assets/mail/roundcube/carddav_refresh.sh
+++ b/tests/assets/mail/roundcube/carddav_refresh.sh
@@ -45,7 +45,7 @@ if (empty($password)) {
 // -----
 
 // init application, start session, init output class, etc.
-$RCMAIL = rcmail::get_instance(0, $GLOBALS['env']);
+$RCMAIL = rcmail::get_instance(0, isset($GLOBALS['env']) ? $GLOBALS['env'] : null);
 
 // trigger startup plugin hook
 $startup = $RCMAIL->plugins->exec_hook('startup', array('task' => $RCMAIL->task, 'action' => $RCMAIL->action));
diff --git a/tests/lib/carddav.sh b/tests/lib/carddav.sh
index 9d90cef2..0d9e1321 100644
--- a/tests/lib/carddav.sh
+++ b/tests/lib/carddav.sh
@@ -261,7 +261,7 @@ roundcube_force_carddav_refresh() {
     fi
     
     pushd "$RCM_DIR" >/dev/null
-    bin/carddav_refresh.sh "$user" "$pass"
+    /usr/bin/php${PHP_VER} bin/carddav_refresh.sh "$user" "$pass"
     code=$?
     popd >/dev/null
     return $code
diff --git a/tests/system-setup/setup-defaults.sh b/tests/system-setup/setup-defaults.sh
index 692b9b37..c3d7d274 100755
--- a/tests/system-setup/setup-defaults.sh
+++ b/tests/system-setup/setup-defaults.sh
@@ -55,3 +55,6 @@ export UPSTREAM_TAG="${UPSTREAM_TAG:-}"
 export MIABLDAP_GIT="${MIABLDAP_GIT:-https://github.com/downtownallday/mailinabox-ldap.git}"
 export MIABLDAP_RELEASE_TAG="${MIABLDAP_RELEASE_TAG:-v55}"
 
+# When running tests that require php, use this version of php. This
+# should be the same as what's in setup/functions.sh.
+export PHP_VER=8.0