diff --git a/lib/_http_server.js b/lib/_http_server.js
index 02cd7a81a9cc0b..15671a2c81e628 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -507,10 +507,12 @@ function onParserExecute(server, socket, parser, state, ret) {
 
 const noop = () => {};
 const badRequestResponse = Buffer.from(
-  `HTTP/1.1 400 ${STATUS_CODES[400]}${CRLF}${CRLF}`, 'ascii'
+  `HTTP/1.1 400 ${STATUS_CODES[400]}${CRLF}` +
+  `Connection: close${CRLF}${CRLF}`, 'ascii'
 );
 const requestHeaderFieldsTooLargeResponse = Buffer.from(
-  `HTTP/1.1 431 ${STATUS_CODES[431]}${CRLF}${CRLF}`, 'ascii'
+  `HTTP/1.1 431 ${STATUS_CODES[431]}${CRLF}` +
+  `Connection: close${CRLF}${CRLF}`, 'ascii'
 );
 function socketOnError(e) {
   // Ignore further errors
diff --git a/test/parallel/test-http-blank-header.js b/test/parallel/test-http-blank-header.js
index fd447b46d213a9..696b16f4995b57 100644
--- a/test/parallel/test-http-blank-header.js
+++ b/test/parallel/test-http-blank-header.js
@@ -52,7 +52,9 @@ server.listen(0, common.mustCall(() => {
     received += data.toString();
   }));
   c.on('end', common.mustCall(() => {
-    assert.strictEqual(received, 'HTTP/1.1 400 Bad Request\r\n\r\n');
+    assert.strictEqual(received,
+                       'HTTP/1.1 400 Bad Request\r\n' +
+                       'Connection: close\r\n\r\n');
     c.end();
   }));
   c.on('close', common.mustCall(() => server.close()));
diff --git a/test/parallel/test-http-header-overflow.js b/test/parallel/test-http-header-overflow.js
index a9bf5cbfa08601..167dada928801c 100644
--- a/test/parallel/test-http-header-overflow.js
+++ b/test/parallel/test-http-header-overflow.js
@@ -39,7 +39,8 @@ server.listen(0, mustCall(() => {
   c.on('end', mustCall(() => {
     assert.strictEqual(
       received,
-      'HTTP/1.1 431 Request Header Fields Too Large\r\n\r\n'
+      'HTTP/1.1 431 Request Header Fields Too Large\r\n' +
+      'Connection: close\r\n\r\n'
     );
     c.end();
   }));
diff --git a/test/parallel/test-http-server-destroy-socket-on-client-error.js b/test/parallel/test-http-server-destroy-socket-on-client-error.js
index 9d51364183385b..7085401883933b 100644
--- a/test/parallel/test-http-server-destroy-socket-on-client-error.js
+++ b/test/parallel/test-http-server-destroy-socket-on-client-error.js
@@ -37,7 +37,9 @@ server.listen(0, () => {
   });
 
   socket.on('end', mustCall(() => {
-    const expected = Buffer.from('HTTP/1.1 400 Bad Request\r\n\r\n');
+    const expected = Buffer.from(
+      'HTTP/1.1 400 Bad Request\r\nConnection: close\r\n\r\n'
+    );
     assert(Buffer.concat(chunks).equals(expected));
 
     server.close();