diff --git a/.travis.yml b/.travis.yml
index 8aafb5d..5dcc85c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ sudo: required
 dist: trusty
 language: php
 php: 7.2
-env: WP_VERSION=latest WP_MULTISITE=0 WP_CORE_DIR=/tmp/wordpress
+env: WP_VERSION=latest WP_MULTISITE=1 WP_CORE_DIR=/tmp/wordpress
 
 install:
   - bash bin/install-wp-tests.sh wporg_5ftf_test root '' localhost $WP_VERSION
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 747a336..bc3f08f 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -6,7 +6,9 @@
 	convertNoticesToExceptions="true"
 	convertWarningsToExceptions="true"
 	>
-
+	<php>
+		<const name="WP_TESTS_MULTISITE" value="1" />
+	</php>
 	<testsuites>
 		<testsuite name="Five for the Future Plugin">
 			<directory prefix="test-" suffix=".php">