diff --git a/travis/before_install.bash b/travis/before_install.bash
index 7e7ed8fe..23c7d9cf 100755
--- a/travis/before_install.bash
+++ b/travis/before_install.bash
@@ -18,9 +18,11 @@ then
   echo "host      replication pgx_replication 127.0.0.1/32      md5"      >> /etc/postgresql/$PGVERSION/main/pg_hba.conf
   echo "host      pgx_test pgx_replication 127.0.0.1/32      md5"      >> /etc/postgresql/$PGVERSION/main/pg_hba.conf
   sudo chmod 777 /etc/postgresql/$PGVERSION/main/postgresql.conf
-  [[ $PGVERSION < 9.6 ]] || echo "wal_level='logical'"     >> /etc/postgresql/$PGVERSION/main/postgresql.conf
-  [[ $PGVERSION < 9.6 ]] || echo "max_wal_senders=5"       >> /etc/postgresql/$PGVERSION/main/postgresql.conf
-  [[ $PGVERSION < 9.6 ]] || echo "max_replication_slots=5" >> /etc/postgresql/$PGVERSION/main/postgresql.conf
+  if $(dpkg --compare-versions $PGVERSION ge 9.6) ; then
+    echo "wal_level='logical'"     >> /etc/postgresql/$PGVERSION/main/postgresql.conf
+    echo "max_wal_senders=5"       >> /etc/postgresql/$PGVERSION/main/postgresql.conf
+    echo "max_replication_slots=5" >> /etc/postgresql/$PGVERSION/main/postgresql.conf
+  fi
   sudo /etc/init.d/postgresql restart
 fi