diff --git a/test/proxy.ts b/test/proxy.ts
index 38305415..f7f48ad6 100644
--- a/test/proxy.ts
+++ b/test/proxy.ts
@@ -26,7 +26,7 @@ describe('proxy', function () {
     let targetPort: number
 
     beforeEach(function (done) {
-        clock = sinon.useFakeTimers()
+        clock = sinon.useFakeTimers({ shouldClearNativeTimers: true })
         port = nextPort()
         server = createServer({
             proxy: true
diff --git a/test/server.ts b/test/server.ts
index 5d7ea456..15fa4a6e 100644
--- a/test/server.ts
+++ b/test/server.ts
@@ -32,7 +32,7 @@ describe('server', function () {
         port = nextPort()
         server = createServer()
         server.listen(port, done)
-        clock = sinon.useFakeTimers()
+        clock = sinon.useFakeTimers({ shouldClearNativeTimers: true })
     })
 
     beforeEach(function (done) {
@@ -535,7 +535,6 @@ describe('server', function () {
         })
 
         it.skip('should calculate the response twice after the interval', function (done) {
-            clock = sinon.useFakeTimers()
             let first = true
             const delay = (parameters.exchangeLifetime * 1000) + 1
 
@@ -1181,7 +1180,7 @@ describe('server LRU', function () {
     }
 
     beforeEach(function (done) {
-        clock = sinon.useFakeTimers()
+        clock = sinon.useFakeTimers({ shouldClearNativeTimers: true })
         port = nextPort()
         server = createServer()
         server.listen(port, done)
@@ -1236,7 +1235,7 @@ describe('server block cache', function () {
     }
 
     beforeEach(function (done) {
-        clock = sinon.useFakeTimers()
+        clock = sinon.useFakeTimers({ shouldClearNativeTimers: true })
         port = nextPort()
         server = createServer()
         server.listen(port, done)
@@ -1297,7 +1296,7 @@ describe('Client Identifier', function () {
     }
 
     beforeEach(function (done) {
-        clock = sinon.useFakeTimers()
+        clock = sinon.useFakeTimers({ shouldClearNativeTimers: true })
         port = nextPort()
 
         server = createServer({
diff --git a/test/share-socket.ts b/test/share-socket.ts
index 69373f3a..bc096e23 100644
--- a/test/share-socket.ts
+++ b/test/share-socket.ts
@@ -437,7 +437,7 @@ describe('share-socket', function () {
     })
 
     it('should error after ~247 seconds', function (done) {
-        const clock = sinon.useFakeTimers()
+       const clock = sinon.useFakeTimers({ shouldClearNativeTimers: true })
         const req = request(`coap://localhost:${port + 1}`)
         req.end()