diff --git a/test/e2e/internal/tests/backup/fixtures.go b/test/e2e/internal/tests/backup/fixtures.go
index 1f3b870..bb12cf5 100644
--- a/test/e2e/internal/tests/backup/fixtures.go
+++ b/test/e2e/internal/tests/backup/fixtures.go
@@ -285,7 +285,7 @@ func newSrcClusterWithPlugin(namespace string) *cloudnativepgv1.Cluster {
 		Spec: cloudnativepgv1.ClusterSpec{
 			Instances:       2,
 			ImagePullPolicy: corev1.PullAlways,
-			Plugins: cloudnativepgv1.PluginConfigurationList{
+			Plugins: []cloudnativepgv1.PluginConfiguration{
 				{
 					Name: "barman-cloud.cloudnative-pg.io",
 					Parameters: map[string]string{
@@ -325,7 +325,7 @@ func newDstClusterWithPlugin(namespace string) *cloudnativepgv1.Cluster {
 					Source: "source",
 				},
 			},
-			Plugins: cloudnativepgv1.PluginConfigurationList{
+			Plugins: []cloudnativepgv1.PluginConfiguration{
 				{
 					Name: "barman-cloud.cloudnative-pg.io",
 					Parameters: map[string]string{
@@ -431,7 +431,7 @@ func newDstClusterInTreeS3(namespace string) *cloudnativepgv1.Cluster {
 					"log_min_messages": "DEBUG4",
 				},
 			},
-			Plugins: cloudnativepgv1.PluginConfigurationList{
+			Plugins: []cloudnativepgv1.PluginConfiguration{
 				{
 					Name: "barman-cloud.cloudnative-pg.io",
 					Parameters: map[string]string{
@@ -528,7 +528,7 @@ func newDstClusterInTreeAzure(namespace string) *cloudnativepgv1.Cluster {
 					Source: "source",
 				},
 			},
-			Plugins: cloudnativepgv1.PluginConfigurationList{
+			Plugins: []cloudnativepgv1.PluginConfiguration{
 				{
 					Name: "barman-cloud.cloudnative-pg.io",
 					Parameters: map[string]string{
@@ -624,7 +624,7 @@ func newDstClusterInTreeGCS(namespace string) *cloudnativepgv1.Cluster {
 					Source: "source",
 				},
 			},
-			Plugins: cloudnativepgv1.PluginConfigurationList{
+			Plugins: []cloudnativepgv1.PluginConfiguration{
 				{
 					Name: "barman-cloud.cloudnative-pg.io",
 					Parameters: map[string]string{
diff --git a/test/e2e/internal/tests/replicacluster/fixtures.go b/test/e2e/internal/tests/replicacluster/fixtures.go
index 50d3624..79e386d 100644
--- a/test/e2e/internal/tests/replicacluster/fixtures.go
+++ b/test/e2e/internal/tests/replicacluster/fixtures.go
@@ -112,7 +112,7 @@ func newSrcCluster(namespace string) *cloudnativepgv1.Cluster {
 		Spec: cloudnativepgv1.ClusterSpec{
 			Instances:       2,
 			ImagePullPolicy: corev1.PullAlways,
-			Plugins: cloudnativepgv1.PluginConfigurationList{
+			Plugins: []cloudnativepgv1.PluginConfiguration{
 				{
 					Name: "barman-cloud.cloudnative-pg.io",
 					Parameters: map[string]string{
@@ -223,7 +223,7 @@ func newReplicaCluster(namespace string) *cloudnativepgv1.Cluster {
 					Source: "source",
 				},
 			},
-			Plugins: cloudnativepgv1.PluginConfigurationList{
+			Plugins: []cloudnativepgv1.PluginConfiguration{
 				{
 					Name: "barman-cloud.cloudnative-pg.io",
 					Parameters: map[string]string{