diff --git a/acceptance/deploy.sh b/acceptance/deploy.sh
index 7beb5338..9400bda5 100755
--- a/acceptance/deploy.sh
+++ b/acceptance/deploy.sh
@@ -41,6 +41,13 @@ TEST_ID=${TEST_ID:-default}
 
 if [ "${tool}" == "helm" ]; then
   set -v
+  flags=()
+  if [ "${IMAGE_PULL_SECRET}" != "" ]; then
+    flags+=( --set imagePullSecrets[0].name=${IMAGE_PULL_SECRET})
+    flags+=( --set image.actionsRunnerImagePullSecrets[0].name=${IMAGE_PULL_SECRET})
+    flags+=( --set githubWebhookServer.imagePullSecrets[0].name=${IMAGE_PULL_SECRET})
+  fi
+  set -vx
   helm upgrade --install actions-runner-controller \
     charts/actions-runner-controller \
     -n actions-runner-system \
@@ -51,10 +58,7 @@ if [ "${tool}" == "helm" ]; then
     --set image.tag=${VERSION} \
     --set podAnnotations.test-id=${TEST_ID} \
     --set githubWebhookServer.podAnnotations.test-id=${TEST_ID} \
-    --set imagePullSecrets[0].name=${IMAGE_PULL_SECRET} \
-    --set image.actionsRunnerImagePullSecrets[0].name=${IMAGE_PULL_SECRET} \
-    --set githubWebhookServer.imagePullSecrets[0].name=${IMAGE_PULL_SECRET} \
-    --set image.imagePullPolicy=${IMAGE_PULL_POLICY} \
+    ${flags[@]} --set image.imagePullPolicy=${IMAGE_PULL_POLICY} \
     -f ${VALUES_FILE}
   set +v
   # To prevent `CustomResourceDefinition.apiextensions.k8s.io "runners.actions.summerwind.dev" is invalid: metadata.annotations: Too long: must have at most 262144 bytes`
diff --git a/acceptance/values.yaml b/acceptance/values.yaml
index 95b1c8a9..3c970774 100644
--- a/acceptance/values.yaml
+++ b/acceptance/values.yaml
@@ -1,18 +1,18 @@
 # Set actions-runner-controller settings for testing
 logLevel: "-4"
-imagePullSecrets:
-- name:
+imagePullSecrets: []
 image:
-  actionsRunnerImagePullSecrets:
-  - name:
+  # This needs to be an empty array rather than a single-item array with empty name.
+  # Otherwise you end up with the following error on helm-upgrade:
+  #   Error: UPGRADE FAILED: failed to create patch: map: map[] does not contain declared merge key: name && failed to create patch: map: map[] does not contain declared merge key: name
+  actionsRunnerImagePullSecrets: []
 runner:
   statusUpdateHook:
     enabled: true
 rbac:
   allowGrantingKubernetesContainerModePermissions: true
 githubWebhookServer:
-  imagePullSecrets:
-  - name:
+  imagePullSecrets: []
   logLevel: "-4"
   enabled: true
   labels: {}