diff --git a/lib/mock/mock-utils.js b/lib/mock/mock-utils.js
index 036d39680ff..c8c0ed1eef1 100644
--- a/lib/mock/mock-utils.js
+++ b/lib/mock/mock-utils.js
@@ -358,5 +358,6 @@ module.exports = {
   buildMockDispatch,
   checkNetConnect,
   buildMockOptions,
-  getHeaderByName
+  getHeaderByName,
+  buildHeadersFromArray
 }
diff --git a/test/mock-agent.js b/test/mock-agent.js
index ab852896daf..eb58afc6ad1 100644
--- a/test/mock-agent.js
+++ b/test/mock-agent.js
@@ -2282,7 +2282,7 @@ test('MockAgent - disableNetConnect should throw if dispatch not found by net co
 })
 
 test('MockAgent - headers function interceptor', async (t) => {
-  t = tspl(t, { plan: 7 })
+  t = tspl(t, { plan: 8 })
 
   const server = createServer((req, res) => {
     t.fail('should not be called')
@@ -2310,7 +2310,7 @@ test('MockAgent - headers function interceptor', async (t) => {
       t.strictEqual(typeof headers, 'object')
       return !Object.keys(headers).includes('authorization')
     }
-  }).reply(200, 'foo').times(2)
+  }).reply(200, 'foo').times(3)
 
   await t.rejects(request(`${baseUrl}/foo`, {
     method: 'GET',
@@ -2319,6 +2319,11 @@ test('MockAgent - headers function interceptor', async (t) => {
     }
   }), new MockNotMatchedError(`Mock dispatch not matched for headers '{"Authorization":"Bearer foo"}' on path '/foo': subsequent request to origin ${baseUrl} was not allowed (net.connect disabled)`))
 
+  await t.rejects(request(`${baseUrl}/foo`, {
+    method: 'GET',
+    headers: ['Authorization', 'Bearer foo']
+  }), new MockNotMatchedError(`Mock dispatch not matched for headers '["Authorization","Bearer foo"]' on path '/foo': subsequent request to origin ${baseUrl} was not allowed (net.connect disabled)`))
+
   {
     const { statusCode } = await request(`${baseUrl}/foo`, {
       method: 'GET',
diff --git a/test/mock-utils.js b/test/mock-utils.js
index 744011c70b8..f27a6763ae9 100644
--- a/test/mock-utils.js
+++ b/test/mock-utils.js
@@ -8,7 +8,8 @@ const {
   getMockDispatch,
   getResponseData,
   getStatusText,
-  getHeaderByName
+  getHeaderByName,
+  buildHeadersFromArray
 } = require('../lib/mock/mock-utils')
 
 test('deleteMockDispatch - should do nothing if not able to find mock dispatch', (t) => {
@@ -210,3 +211,16 @@ test('getHeaderByName', (t) => {
 
   t.end()
 })
+
+describe('buildHeadersFromArray', () => {
+  test('it should build headers from array', (t) => {
+    t = tspl(t, { plan: 2 })
+
+    const headers = buildHeadersFromArray([
+      'key', 'value'
+    ])
+
+    t.deepStrictEqual(Object.keys(headers).length, 1)
+    t.strictEqual(headers.key, 'value')
+  })
+})