diff --git a/certbot-apache/certbot_apache/tests/apache-conf-files/apache-conf-test b/certbot-apache/certbot_apache/tests/apache-conf-files/apache-conf-test
index e12adde78..5d273a498 100755
--- a/certbot-apache/certbot_apache/tests/apache-conf-files/apache-conf-test
+++ b/certbot-apache/certbot_apache/tests/apache-conf-files/apache-conf-test
@@ -3,6 +3,11 @@
 # A hackish script to see if the client is behaving as expected 
 # with each of the "passing" conf files.
 
+if [ -z "$ACME_SERVER_URI" ]; then
+    echo Please set ACME_SERVER_URI.
+    exit 1
+fi
+
 export EA=/etc/apache2/ 
 TESTDIR="`dirname $0`"
 cd $TESTDIR/passing