diff --git a/resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh b/resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh
index 780cfdfba8e9b..0e05b523ccc9f 100755
--- a/resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh
+++ b/resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh
@@ -42,7 +42,11 @@ fi
 
 SPARK_CLASSPATH="$SPARK_CLASSPATH:${SPARK_HOME}/jars/*"
 env | grep SPARK_JAVA_OPT_ | sort -t_ -k4 -n | sed 's/[^=]*=\(.*\)/\1/g' > /tmp/java_opts.txt
-readarray -t SPARK_EXECUTOR_JAVA_OPTS < /tmp/java_opts.txt
+if [ "$(command -v readarray)" ]; then
+  readarray -t SPARK_EXECUTOR_JAVA_OPTS < /tmp/java_opts.txt
+else
+  SPARK_EXECUTOR_JAVA_OPTS=("${(@f)$(< /tmp/java_opts.txt)}")
+fi
 
 if [ -n "$SPARK_EXTRA_CLASSPATH" ]; then
   SPARK_CLASSPATH="$SPARK_CLASSPATH:$SPARK_EXTRA_CLASSPATH"