diff --git a/integration/scripts/files/elements/ubuntu-cassandra/install.d/10-cassandra b/integration/scripts/files/elements/ubuntu-cassandra/install.d/10-cassandra
index 14a6e900ca..2430715608 100755
--- a/integration/scripts/files/elements/ubuntu-cassandra/install.d/10-cassandra
+++ b/integration/scripts/files/elements/ubuntu-cassandra/install.d/10-cassandra
@@ -4,12 +4,12 @@ set -ex
 set -o xtrace
 
 # Set CASSANDRA_JAVA to override which release of Java to use, defaults to 8
-if [ ! -z "$CASSANDRA_JAVA" ]; then CASSANDRA_JAVA=8; fi
+if [ -z "$CASSANDRA_JAVA" ]; then CASSANDRA_JAVA=8; fi
 
 # Set CASSANDRA_RELEASE to override which casandra release to use, defaults to 311x
 #  For current releases supported, see http://cassandra.apache.org/download/ or
 #  http://dl.bintray.com/apache/cassandra/dists/
-if [ ! -z "$CASSANDRA_RELEASE" ]; then CASSANDRA_RELEASE=311x; fi
+if [ -z "$CASSANDRA_RELEASE" ]; then CASSANDRA_RELEASE=311x; fi
 
 export DEBIAN_FRONTEND=noninteractive
 apt-get --allow-unauthenticated install -qy curl