diff --git a/jsonnet/kube-thanos/kube-thanos-compact.libsonnet b/jsonnet/kube-thanos/kube-thanos-compact.libsonnet
index 0bb34e0..a49f928 100644
--- a/jsonnet/kube-thanos/kube-thanos-compact.libsonnet
+++ b/jsonnet/kube-thanos/kube-thanos-compact.libsonnet
@@ -52,6 +52,7 @@ function(params) {
   assert std.isNumber(tc.config.replicas) && (tc.config.replicas == 0 || tc.config.replicas == 1) : 'thanos compact replicas can only be 0 or 1',
   assert std.isObject(tc.config.resources),
   assert std.isObject(tc.config.volumeClaimTemplate),
+  assert !std.objectHas(tc.config.volumeClaimTemplate, 'spec') || std.assertEqual(tc.config.volumeClaimTemplate.spec.accessModes, ['ReadWriteOnce']) : 'thanos compact PVC accessMode can only be ReadWriteOnce',
   assert std.isBoolean(tc.config.serviceMonitor),
   assert std.isArray(tc.config.deduplicationReplicaLabels),
 
diff --git a/jsonnet/kube-thanos/kube-thanos-receive.libsonnet b/jsonnet/kube-thanos/kube-thanos-receive.libsonnet
index e0c2d1a..050f7a6 100644
--- a/jsonnet/kube-thanos/kube-thanos-receive.libsonnet
+++ b/jsonnet/kube-thanos/kube-thanos-receive.libsonnet
@@ -11,6 +11,7 @@ function(params) {
   assert std.isObject(tr.config.resources),
   assert std.isBoolean(tr.config.serviceMonitor),
   assert std.isObject(tr.config.volumeClaimTemplate),
+  assert !std.objectHas(tr.config.volumeClaimTemplate, 'spec') || std.assertEqual(tr.config.volumeClaimTemplate.spec.accessModes, ['ReadWriteOnce']) : 'thanos receive PVC accessMode can only be ReadWriteOnce',
 
   service: {
     apiVersion: 'v1',
diff --git a/jsonnet/kube-thanos/kube-thanos-rule.libsonnet b/jsonnet/kube-thanos/kube-thanos-rule.libsonnet
index d836ad3..b67b602 100644
--- a/jsonnet/kube-thanos/kube-thanos-rule.libsonnet
+++ b/jsonnet/kube-thanos/kube-thanos-rule.libsonnet
@@ -56,6 +56,8 @@ function(params) {
   assert std.isObject(tr.config.resources),
   assert std.isBoolean(tr.config.serviceMonitor),
   assert std.isObject(tr.config.volumeClaimTemplate),
+  assert !std.objectHas(tr.config.volumeClaimTemplate, 'spec') || std.assertEqual(tr.config.volumeClaimTemplate.spec.accessModes, ['ReadWriteOnce']) : 'thanos rule PVC accessMode can only be ReadWriteOnce',
+
 
   service: {
     apiVersion: 'v1',
diff --git a/jsonnet/kube-thanos/kube-thanos-store.libsonnet b/jsonnet/kube-thanos/kube-thanos-store.libsonnet
index e838acb..9630f05 100644
--- a/jsonnet/kube-thanos/kube-thanos-store.libsonnet
+++ b/jsonnet/kube-thanos/kube-thanos-store.libsonnet
@@ -25,6 +25,7 @@ function(params) {
   assert std.isObject(ts.config.resources),
   assert std.isBoolean(ts.config.serviceMonitor),
   assert std.isObject(ts.config.volumeClaimTemplate),
+  assert !std.objectHas(ts.config.volumeClaimTemplate, 'spec') || std.assertEqual(ts.config.volumeClaimTemplate.spec.accessModes, ['ReadWriteOnce']) : 'thanos store PVC accessMode can only be ReadWriteOnce',
 
   service: {
     apiVersion: 'v1',