diff --git a/test/UnauthorizedError.test.ts b/test/UnauthorizedError.test.ts
index d6952131..afc3eed8 100644
--- a/test/UnauthorizedError.test.ts
+++ b/test/UnauthorizedError.test.ts
@@ -1,5 +1,5 @@
 import { UnauthorizedError } from '../src/errors/UnauthorizedError';
-import assert from 'assert';
+import * as assert from 'assert';
 
 describe('Unauthorized Error', () => {
   const e = new UnauthorizedError('credentials_bad_format', new Error('a'));
diff --git a/test/jwt.test.ts b/test/jwt.test.ts
index f8c3071a..b6b79ed4 100644
--- a/test/jwt.test.ts
+++ b/test/jwt.test.ts
@@ -2,7 +2,7 @@
 import * as jwt from 'jsonwebtoken';
 import * as express from 'express';
 import { expressjwt, UnauthorizedError, ExpressJwtRequest, GetVerificationKey } from '../src';
-import assert from 'assert';
+import * as assert from 'assert';
 
 
 describe('failure tests', function () {
diff --git a/test/multitenancy.test.ts b/test/multitenancy.test.ts
index 776fca35..73c116ec 100644
--- a/test/multitenancy.test.ts
+++ b/test/multitenancy.test.ts
@@ -1,7 +1,7 @@
 import * as jwt from 'jsonwebtoken';
 import * as express from 'express';
 import { expressjwt, ExpressJwtRequest, GetVerificationKey } from '../src';
-import assert from 'assert';
+import * as assert from 'assert';
 
 describe('multitenancy', function () {
   const req = {} as ExpressJwtRequest;
diff --git a/test/revocation.test.ts b/test/revocation.test.ts
index 219d7dc5..8ede42ae 100644
--- a/test/revocation.test.ts
+++ b/test/revocation.test.ts
@@ -1,7 +1,7 @@
 import * as jwt from 'jsonwebtoken';
 import * as express from 'express';
 import { expressjwt, ExpressJwtRequest } from '../src';
-import assert from 'assert';
+import * as assert from 'assert';
 
 describe('revoked jwts', function () {
   const secret = 'shhhhhh';
diff --git a/test/string_token.test.ts b/test/string_token.test.ts
index 513deed7..c21117f5 100644
--- a/test/string_token.test.ts
+++ b/test/string_token.test.ts
@@ -1,7 +1,7 @@
 import * as jwt from 'jsonwebtoken';
 import * as express from 'express';
 import { expressjwt, ExpressJwtRequest } from '../src';
-import assert from 'assert';
+import * as assert from 'assert';
 
 
 describe('string tokens', function () {
diff --git a/tsconfig.json b/tsconfig.json
index 6d2144ca..dd76af26 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,10 +3,9 @@
     "outDir": "./dist",
     "allowJs": true,
     "target": "es5",
-    "esModuleInterop": true,
     "declaration": true
   },
   "include": [
     "./src/**/*"
   ]
-}
+}
\ No newline at end of file