diff --git a/hack/.shellcheck_failures b/hack/.shellcheck_failures
index b5b1c14911f..a40c3cef403 100644
--- a/hack/.shellcheck_failures
+++ b/hack/.shellcheck_failures
@@ -85,8 +85,6 @@
 ./test/e2e_node/environment/setup_host.sh
 ./test/e2e_node/gubernator.sh
 ./test/images/image-util.sh
-./test/images/pets/zookeeper-installer/install.sh
-./test/images/pets/zookeeper-installer/on-start.sh
 ./test/images/volume/gluster/run_gluster.sh
 ./test/images/volume/iscsi/create_block.sh
 ./test/images/volume/nfs/run_nfs.sh
diff --git a/test/images/pets/zookeeper-installer/install.sh b/test/images/pets/zookeeper-installer/install.sh
index e769cb0cb25..fbb5d8ddf4c 100755
--- a/test/images/pets/zookeeper-installer/install.sh
+++ b/test/images/pets/zookeeper-installer/install.sh
@@ -55,10 +55,10 @@ cp "${INSTALL_VOLUME}"/zookeeper/conf/zoo_sample.cfg "${INSTALL_VOLUME}"/zookeep
 
 # TODO: Should dynamic config be tied to the version?
 IFS="." read -ra RELEASE <<< "${VERSION}"
-if [ $(expr "${RELEASE[1]}") -gt 4 ]; then
+if [ "$(("${RELEASE[1]}"))" -gt 4 ]; then
     echo zookeeper-"${VERSION}" supports dynamic reconfiguration, enabling it
     echo "standaloneEnabled=false" >> "${INSTALL_VOLUME}"/zookeeper/conf/zoo.cfg
-    echo "dynamicConfigFile="${INSTALL_VOLUME}"/zookeeper/conf/zoo.cfg.dynamic" >> "${INSTALL_VOLUME}"/zookeeper/conf/zoo.cfg
+    echo "dynamicConfigFile=${INSTALL_VOLUME}/zookeeper/conf/zoo.cfg.dynamic" >> "${INSTALL_VOLUME}"/zookeeper/conf/zoo.cfg
 fi
 
 # TODO: This is a hack, netcat is convenient to have in the zookeeper container
diff --git a/test/images/pets/zookeeper-installer/on-start.sh b/test/images/pets/zookeeper-installer/on-start.sh
index 6b642f5f693..92eadee009b 100755
--- a/test/images/pets/zookeeper-installer/on-start.sh
+++ b/test/images/pets/zookeeper-installer/on-start.sh
@@ -36,7 +36,7 @@ MY_ID_FILE=/tmp/zookeeper/myid
 HOSTNAME=$(hostname)
 
 while read -ra LINE; do
-    PEERS=("${PEERS[@]}" $LINE)
+    PEERS=("${PEERS[@]}" "$LINE")
 done
 
 # Don't add the first member as an observer
@@ -56,7 +56,7 @@ echo "" > "${CFG_BAK}"
 i=0
 LEADER=$HOSTNAME
 for peer in "${PEERS[@]}"; do
-    let i=i+1
+    (( i=i+1 ))
     if [[ "${peer}" == *"${HOSTNAME}"* ]]; then
       MY_ID=$i
       MY_NAME=${peer}
@@ -94,10 +94,10 @@ ADD_SERVER="server.$MY_ID=$MY_NAME:2888:3888:participant;0.0.0.0:2181"
 
 # Prove that we've actually joined the running cluster
 ITERATION=0
-until $(echo config | /opt/nc localhost 2181 | grep "${ADD_SERVER}" > /dev/null); do
+until echo config | /opt/nc localhost 2181 | grep "${ADD_SERVER}" > /dev/null; do
   echo $ITERATION] waiting for updated config to sync back to localhost
   sleep 1
-  let ITERATION=ITERATION+1
+  (( ITERATION=ITERATION+1 ))
   if [ $ITERATION -eq 20 ]; then
     exit 1
   fi