diff --git a/src/acp/control.internal.ts b/src/acp/control.internal.ts
index f319f77a57..7ffa24df7c 100644
--- a/src/acp/control.internal.ts
+++ b/src/acp/control.internal.ts
@@ -24,7 +24,7 @@ import type { ThingPersisted, Url, UrlString } from "../interfaces";
 import { getSourceUrl } from "../resource/resource";
 import { internal_cloneResource } from "../resource/resource.internal";
 import { addIri } from "../thing/add";
-import { getIriAll } from "../thing/get";
+import { getIriAll, getUrlAll } from "../thing/get";
 import { removeAll, removeIri } from "../thing/remove";
 import { setIri } from "../thing/set";
 import {
@@ -165,7 +165,12 @@ export function internal_setControl<ResourceExt extends WithAccessibleAcr>(
   let updatedAcr = setThing(acr, control);
   const acrSubj = getThing(updatedAcr, getSourceUrl(acr));
   // If the ACR has an anchor node, link the Access Control.
-  if (acrSubj !== null) {
+  if (
+    acrSubj !== null &&
+    getUrlAll(acrSubj, acp.accessControl).every(
+      (object) => object.toString() !== asIri(control, getSourceUrl(acr)),
+    )
+  ) {
     updatedAcr = setThing(
       updatedAcr,
       addIri(acrSubj, acp.accessControl, asIri(control, getSourceUrl(acr))),