diff --git a/packages/beacon-node/test/mocks/mockedBeaconChain.ts b/packages/beacon-node/test/mocks/mockedBeaconChain.ts
index c671dc0010fa..58093be936f4 100644
--- a/packages/beacon-node/test/mocks/mockedBeaconChain.ts
+++ b/packages/beacon-node/test/mocks/mockedBeaconChain.ts
@@ -138,6 +138,7 @@ vi.mock("../../src/chain/chain.js", async (importActual) => {
       produceBlindedBlock: vi.fn(),
       getCanonicalBlockAtSlot: vi.fn(),
       recomputeForkChoiceHead: vi.fn(),
+      predictProposerHead: vi.fn(),
       getHeadStateAtCurrentEpoch: vi.fn(),
       getHeadState: vi.fn(),
       updateBuilderStatus: vi.fn(),
diff --git a/packages/beacon-node/test/unit/chain/prepareNextSlot.test.ts b/packages/beacon-node/test/unit/chain/prepareNextSlot.test.ts
index 6d1be3fa8dd5..652749492240 100644
--- a/packages/beacon-node/test/unit/chain/prepareNextSlot.test.ts
+++ b/packages/beacon-node/test/unit/chain/prepareNextSlot.test.ts
@@ -120,6 +120,7 @@ describe("PrepareNextSlot scheduler", () => {
     chainStub.emitter.on(routes.events.EventType.payloadAttributes, spy);
     getForkStub.mockReturnValue(ForkName.bellatrix);
     chainStub.recomputeForkChoiceHead.mockReturnValue({...zeroProtoBlock, slot: SLOTS_PER_EPOCH - 3} as ProtoBlock);
+    chainStub.predictProposerHead.mockReturnValue({...zeroProtoBlock, slot: SLOTS_PER_EPOCH - 3} as ProtoBlock);
     forkChoiceStub.getJustifiedBlock.mockReturnValue({} as ProtoBlock);
     forkChoiceStub.getFinalizedBlock.mockReturnValue({} as ProtoBlock);
     updateBuilderStatus.mockReturnValue(void 0);