diff --git a/test/sequential/test-http-server-keep-alive-timeout-slow-client-headers.js b/test/sequential/test-http-server-keep-alive-timeout-slow-client-headers.js
index 453831ecba88a2..514a98c203e2a8 100644
--- a/test/sequential/test-http-server-keep-alive-timeout-slow-client-headers.js
+++ b/test/sequential/test-http-server-keep-alive-timeout-slow-client-headers.js
@@ -10,6 +10,7 @@ const server = http.createServer(common.mustCall((req, res) => {
 }, 2));
 
 server.keepAliveTimeout = common.platformTimeout(100);
+server.keepAliveTimeoutBuffer = common.platformTimeout(1000);
 
 server.listen(0, common.mustCall(() => {
   const port = server.address().port;
diff --git a/test/sequential/test-http-server-keep-alive-timeout-slow-server.js b/test/sequential/test-http-server-keep-alive-timeout-slow-server.js
index 547aac9ff935ca..3be60ed0973a4d 100644
--- a/test/sequential/test-http-server-keep-alive-timeout-slow-server.js
+++ b/test/sequential/test-http-server-keep-alive-timeout-slow-server.js
@@ -15,6 +15,7 @@ const server = http.createServer(common.mustCall((req, res) => {
 }, 2));
 
 server.keepAliveTimeout = common.platformTimeout(200);
+server.keepAliveTimeoutBuffer = common.platformTimeout(1000);
 
 const agent = new http.Agent({
   keepAlive: true,