diff --git a/dind-cluster.sh b/dind-cluster.sh
index ad0dc7b..1661665 100755
--- a/dind-cluster.sh
+++ b/dind-cluster.sh
@@ -1037,7 +1037,7 @@ function dind::run {
 
   dind::step "Starting DIND container:" "${container_name}"
 
-  if [[ ${DIND_K8S_BIN_DIR} ]]; then
+  if [[ ! -z ${DIND_K8S_BIN_DIR:-} ]]; then
       opts+=(-v ${DIND_K8S_BIN_DIR}:/k8s)
   fi
   if [[ ! ${using_linuxkit} ]]; then
diff --git a/fixed/dind-cluster-stable.sh b/fixed/dind-cluster-stable.sh
index d0c8f2b..accbb81 100755
--- a/fixed/dind-cluster-stable.sh
+++ b/fixed/dind-cluster-stable.sh
@@ -1037,7 +1037,7 @@ function dind::run {
 
   dind::step "Starting DIND container:" "${container_name}"
 
-  if [[ ${DIND_K8S_BIN_DIR} ]]; then
+  if [[ ! -z ${DIND_K8S_BIN_DIR:-} ]]; then
       opts+=(-v ${DIND_K8S_BIN_DIR}:/k8s)
   fi
   if [[ ! ${using_linuxkit} ]]; then
diff --git a/fixed/dind-cluster-v1.10.sh b/fixed/dind-cluster-v1.10.sh
index a10b545..fa44c23 100755
--- a/fixed/dind-cluster-v1.10.sh
+++ b/fixed/dind-cluster-v1.10.sh
@@ -1037,7 +1037,7 @@ function dind::run {
 
   dind::step "Starting DIND container:" "${container_name}"
 
-  if [[ ${DIND_K8S_BIN_DIR} ]]; then
+  if [[ ! -z ${DIND_K8S_BIN_DIR:-} ]]; then
       opts+=(-v ${DIND_K8S_BIN_DIR}:/k8s)
   fi
   if [[ ! ${using_linuxkit} ]]; then
diff --git a/fixed/dind-cluster-v1.11.sh b/fixed/dind-cluster-v1.11.sh
index 7ce8905..0073e0d 100755
--- a/fixed/dind-cluster-v1.11.sh
+++ b/fixed/dind-cluster-v1.11.sh
@@ -1037,7 +1037,7 @@ function dind::run {
 
   dind::step "Starting DIND container:" "${container_name}"
 
-  if [[ ${DIND_K8S_BIN_DIR} ]]; then
+  if [[ ! -z ${DIND_K8S_BIN_DIR:-} ]]; then
       opts+=(-v ${DIND_K8S_BIN_DIR}:/k8s)
   fi
   if [[ ! ${using_linuxkit} ]]; then
diff --git a/fixed/dind-cluster-v1.12.sh b/fixed/dind-cluster-v1.12.sh
index 1fa4392..9b298c8 100755
--- a/fixed/dind-cluster-v1.12.sh
+++ b/fixed/dind-cluster-v1.12.sh
@@ -1037,7 +1037,7 @@ function dind::run {
 
   dind::step "Starting DIND container:" "${container_name}"
 
-  if [[ ${DIND_K8S_BIN_DIR} ]]; then
+  if [[ ! -z ${DIND_K8S_BIN_DIR:-} ]]; then
       opts+=(-v ${DIND_K8S_BIN_DIR}:/k8s)
   fi
   if [[ ! ${using_linuxkit} ]]; then
diff --git a/fixed/dind-cluster-v1.9.sh b/fixed/dind-cluster-v1.9.sh
index 82edbae..59aa104 100755
--- a/fixed/dind-cluster-v1.9.sh
+++ b/fixed/dind-cluster-v1.9.sh
@@ -1037,7 +1037,7 @@ function dind::run {
 
   dind::step "Starting DIND container:" "${container_name}"
 
-  if [[ ${DIND_K8S_BIN_DIR} ]]; then
+  if [[ ! -z ${DIND_K8S_BIN_DIR:-} ]]; then
       opts+=(-v ${DIND_K8S_BIN_DIR}:/k8s)
   fi
   if [[ ! ${using_linuxkit} ]]; then