diff --git a/test/server.ts b/test/server.ts
index 9240ba50..5d7ea456 100644
--- a/test/server.ts
+++ b/test/server.ts
@@ -32,6 +32,7 @@ describe('server', function () {
         port = nextPort()
         server = createServer()
         server.listen(port, done)
+        clock = sinon.useFakeTimers()
     })
 
     beforeEach(function (done) {
@@ -595,8 +596,6 @@ describe('server', function () {
         })
 
         it('should not retry sending the response', function (done) {
-            clock = sinon.useFakeTimers()
-
             let messages = 0
 
             send(generate(packet))
@@ -655,8 +654,6 @@ describe('server', function () {
         })
 
         it('should reply with a confirmable after an ack', function (done) {
-            clock = sinon.useFakeTimers()
-
             send(generate(packet))
             server.on('request', (req, res) => {
                 setTimeout(() => {
@@ -681,8 +678,6 @@ describe('server', function () {
         })
 
         it('should retry sending the response if it does not receive an ack four times before 45s', function (done) {
-            clock = sinon.useFakeTimers()
-
             let messages = 0
 
             send(generate(packet))
@@ -712,8 +707,6 @@ describe('server', function () {
         })
 
         it('should stop resending after it receives an ack', function (done) {
-            clock = sinon.useFakeTimers()
-
             let messages = 0
 
             send(generate(packet))
@@ -744,8 +737,6 @@ describe('server', function () {
         })
 
         it('should not resend with a piggyback response', function (done) {
-            clock = sinon.useFakeTimers()
-
             let messages = 0
 
             send(generate(packet))
@@ -766,8 +757,6 @@ describe('server', function () {
         })
 
         it('should error if it does not receive an ack four times before ~247s', function (done) {
-            clock = sinon.useFakeTimers()
-
             send(generate(packet))
             server.on('request', (req, res) => {
                 // needed to avoid sending a piggyback response
@@ -889,8 +878,6 @@ describe('server', function () {
         })
 
         it('should emit a \'finish\' if the client do not ack for ~247s', function (done) {
-            clock = sinon.useFakeTimers()
-
             doObserve()
 
             server.on('request', (req, res) => {