diff --git a/test/unit-tests/components/views/rooms/RoomHeader/RoomHeader-test.tsx b/test/unit-tests/components/views/rooms/RoomHeader/RoomHeader-test.tsx
index a9f02532c8..b0ffb4f1fe 100644
--- a/test/unit-tests/components/views/rooms/RoomHeader/RoomHeader-test.tsx
+++ b/test/unit-tests/components/views/rooms/RoomHeader/RoomHeader-test.tsx
@@ -52,7 +52,6 @@ import * as ShieldUtils from "../../../../../../src/utils/ShieldUtils";
 import { Container, WidgetLayoutStore } from "../../../../../../src/stores/widgets/WidgetLayoutStore";
 import MatrixClientContext from "../../../../../../src/contexts/MatrixClientContext";
 import { _t } from "../../../../../../src/languageHandler";
-import * as UseCall from "../../../../../../src/hooks/useCall";
 import { SdkContextClass } from "../../../../../../src/contexts/SDKContext";
 import WidgetStore, { type IApp } from "../../../../../../src/stores/WidgetStore";
 import { UIFeature } from "../../../../../../src/settings/UIFeature";
@@ -96,6 +95,10 @@ describe("RoomHeader", () => {
 
         setCardSpy = jest.spyOn(RightPanelStore.instance, "setCard");
         jest.spyOn(ShieldUtils, "shieldStatusForRoom").mockResolvedValue(ShieldUtils.E2EStatus.Normal);
+
+        // Mock CallStore.instance.getCall to return null by default
+        // Individual tests can override this when they need a specific Call object
+        jest.spyOn(CallStore.instance, "getCall").mockReturnValue(null);
     });
 
     afterEach(() => {
@@ -555,7 +558,8 @@ describe("RoomHeader", () => {
 
         it("join button is shown if there is an ongoing call", async () => {
             mockRoomMembers(room, 3);
-            jest.spyOn(UseCall, "useParticipantCount").mockReturnValue(3);
+            // Mock CallStore to return a call with 3 participants
+            jest.spyOn(CallStore.instance, "getCall").mockReturnValue(createMockCall(ROOM_ID, 3));
             render(<RoomHeader room={room} />, getWrapper());
             const joinButton = getByLabelText(document.body, "Join");
             expect(joinButton).not.toHaveAttribute("aria-disabled", "true");
@@ -563,7 +567,8 @@ describe("RoomHeader", () => {
 
         it("join button is disabled if there is an other ongoing call", async () => {
             mockRoomMembers(room, 3);
-            jest.spyOn(UseCall, "useParticipantCount").mockReturnValue(3);
+            // Mock CallStore to return a call with 3 participants
+            jest.spyOn(CallStore.instance, "getCall").mockReturnValue(createMockCall(ROOM_ID, 3));
             jest.spyOn(CallStore.prototype, "connectedCalls", "get").mockReturnValue(
                 new Set([{ roomId: "some_other_room" } as Call]),
             );
@@ -583,7 +588,8 @@ describe("RoomHeader", () => {
 
         it("close lobby button is shown if there is an ongoing call but we are viewing the lobby", async () => {
             mockRoomMembers(room, 3);
-            jest.spyOn(UseCall, "useParticipantCount").mockReturnValue(3);
+            // Mock CallStore to return a call with 3 participants
+            jest.spyOn(CallStore.instance, "getCall").mockReturnValue(createMockCall(ROOM_ID, 3));
             jest.spyOn(SdkContextClass.instance.roomViewStore, "isViewingCall").mockReturnValue(true);
 
             render(<RoomHeader room={room} />, getWrapper());
@@ -789,6 +795,34 @@ describe("RoomHeader", () => {
     });
 });
 
+/**
+ * Creates a mock Call object with stable participants to prevent React dependency errors
+ */
+function createMockCall(roomId: string = "!1:example.org", participantCount: number = 0): Call {
+    const participants = new Map();
+
+    // Create mock participants with devices
+    for (let i = 0; i < participantCount; i++) {
+        const mockMember = {
+            userId: `@user-${i}:example.org`,
+            name: `Member ${i}`,
+        } as RoomMember;
+
+        const deviceSet = new Set([`device-${i}`]);
+        participants.set(mockMember, deviceSet);
+    }
+
+    return {
+        roomId,
+        participants,
+        widget: { id: "test-widget" },
+        connectionState: "disconnected",
+        on: jest.fn(),
+        off: jest.fn(),
+        emit: jest.fn(),
+    } as unknown as Call;
+}
+
 /**
  *
  * @param count the number of users to create