diff --git a/api/kuik/v1alpha1/repository_types.go b/api/kuik/v1alpha1/repository_types.go
index a3f31ea4..fa8bc445 100644
--- a/api/kuik/v1alpha1/repository_types.go
+++ b/api/kuik/v1alpha1/repository_types.go
@@ -11,7 +11,7 @@ import (
 )
 
 type DurationOverride struct {
-	time.Duration `protobuf:"varint,1,opt,name=duration,casttype=time.Duration"`
+	time.Duration `json:"-" protobuf:"varint,1,opt,name=duration,casttype=time.Duration"`
 }
 
 // This re-implements metav1.Duration' UnmarshalJSON and adds support for a 'd' (days) suffix
diff --git a/config/crd/bases/kuik.enix.io_repositories.yaml b/config/crd/bases/kuik.enix.io_repositories.yaml
index ef1d8da6..043b2883 100644
--- a/config/crd/bases/kuik.enix.io_repositories.yaml
+++ b/config/crd/bases/kuik.enix.io_repositories.yaml
@@ -75,7 +75,7 @@ spec:
                 description: UpdateInterval is the interval in human readable format
                   (1m, 1h, 1d...) at which matched CachedImages from this Repository
                   are updated (see spec.UpdateFilters)
-                type: string
+                type: object
             required:
             - name
             type: object
diff --git a/helm/kube-image-keeper/crds/repository-crd.yaml b/helm/kube-image-keeper/crds/repository-crd.yaml
index f9fbf589..c467c0dc 100644
--- a/helm/kube-image-keeper/crds/repository-crd.yaml
+++ b/helm/kube-image-keeper/crds/repository-crd.yaml
@@ -74,7 +74,7 @@ spec:
                 description: UpdateInterval is the interval in human readable format
                   (1m, 1h, 1d...) at which matched CachedImages from this Repository
                   are updated (see spec.UpdateFilters)
-                type: string
+                type: object
             required:
             - name
             type: object