diff --git a/stackit/internal/services/ske/cluster/resource.go b/stackit/internal/services/ske/cluster/resource.go
index c2b29207..3fc6c48a 100644
--- a/stackit/internal/services/ske/cluster/resource.go
+++ b/stackit/internal/services/ske/cluster/resource.go
@@ -564,6 +564,10 @@ func (r *clusterResource) Schema(_ context.Context, _ resource.SchemaRequest, re
 						"timezone": schema.StringAttribute{
 							Description: "Timezone name corresponding to a file in the IANA Time Zone database. i.e. `Europe/Berlin`.",
 							Optional:    true,
+							Computed:    true,
+							PlanModifiers: []planmodifier.String{
+								stringplanmodifier.UseStateForUnknown(),
+							},
 						},
 					},
 				},