diff --git a/tedi/components/overlay/tooltip/tooltip-trigger/tooltip-trigger.component.spec.ts b/tedi/components/overlay/tooltip/tooltip-trigger/tooltip-trigger.component.spec.ts
index 608c9db6d..9246801b6 100644
--- a/tedi/components/overlay/tooltip/tooltip-trigger/tooltip-trigger.component.spec.ts
+++ b/tedi/components/overlay/tooltip/tooltip-trigger/tooltip-trigger.component.spec.ts
@@ -6,7 +6,6 @@ import { Renderer2 } from "@angular/core";
 
 class MockTooltipComponent {
   descriptionId = "mock-tooltip-id";
-  isOpen = jest.fn(() => false);
   isContentHovered = jest.fn(() => false);
   timeoutDelay = jest.fn(() => 100);
   hideTimeout?: ReturnType<typeof setTimeout>;
@@ -227,25 +226,13 @@ describe("TooltipTriggerComponent", () => {
       expect(btn.getAttribute("tabindex")).toBe("2");
     });
 
-    it("should set ARIA attributes on interactive element when closed", () => {
+    it("should set aria-describedby on interactive element", () => {
       hostEl.innerHTML = `<button>Click me</button>`;
       const btn = hostEl.querySelector("button")!;
       component.ngAfterContentChecked();
       fixture.detectChanges();
 
       expect(btn.getAttribute("aria-describedby")).toBe("mock-tooltip-id");
-      expect(btn.getAttribute("aria-expanded")).toBe("false");
-    });
-
-    it("should set aria-expanded to true when tooltip is open", () => {
-      tooltip.isOpen = jest.fn(() => true);
-      hostEl.innerHTML = `<button>Click me</button>`;
-      const btn = hostEl.querySelector("button")!;
-      component.ngAfterContentChecked();
-      fixture.detectChanges();
-
-      expect(btn.getAttribute("aria-describedby")).toBe("mock-tooltip-id");
-      expect(btn.getAttribute("aria-expanded")).toBe("true");
     });
   });
 });
diff --git a/tedi/components/overlay/tooltip/tooltip-trigger/tooltip-trigger.component.ts b/tedi/components/overlay/tooltip/tooltip-trigger/tooltip-trigger.component.ts
index cce6165bd..0ca55f61e 100644
--- a/tedi/components/overlay/tooltip/tooltip-trigger/tooltip-trigger.component.ts
+++ b/tedi/components/overlay/tooltip/tooltip-trigger/tooltip-trigger.component.ts
@@ -31,11 +31,7 @@ export class TooltipTriggerComponent implements AfterContentChecked {
       const element = this.interactiveElement();
       if (!element) return;
 
-      const descriptionId = this.tooltip.descriptionId;
-      const isOpen = this.tooltip.isOpen();
-
-      element.setAttribute("aria-describedby", descriptionId);
-      element.setAttribute("aria-expanded", String(isOpen));
+      element.setAttribute("aria-describedby", this.tooltip.descriptionId);
     });
   }