diff --git a/src/rln_contract.spec.ts b/src/rln_contract.spec.ts
index 8d8187c..ffd97c2 100644
--- a/src/rln_contract.spec.ts
+++ b/src/rln_contract.spec.ts
@@ -18,9 +18,9 @@ describe("RLN Contract abstraction", () => {
       provider: voidSigner,
     });
 
-    rlnContract["_contract" as any] = {
+    rlnContract["_contract"] = {
       queryFilter: () => Promise.resolve([mockEvent()]),
-    };
+    } as unknown as ethers.Contract;
     chai.spy.on(rlnContract, "contract.queryFilter");
 
     await rlnContract.fetchMembers(rlnInstance);
@@ -39,9 +39,9 @@ describe("RLN Contract abstraction", () => {
       provider: voidSigner,
     });
 
-    rlnContract["_contract" as any] = {
+    rlnContract["_contract"] = {
       MEMBERSHIP_DEPOSIT: () => Promise.resolve(1),
-    };
+    } as unknown as ethers.Contract;
     chai.spy.on(rlnContract, "contract.MEMBERSHIP_DEPOSIT");
 
     const contractSpy = chai.spy.on(rlnContract, "contract.register");