diff --git a/test/parallel/test-http-set-timeout-server.js b/test/parallel/test-http-set-timeout-server.js
index 98072ab9c61b7e..1b485d626b0eee 100644
--- a/test/parallel/test-http-set-timeout-server.js
+++ b/test/parallel/test-http-set-timeout-server.js
@@ -21,9 +21,10 @@ function run() {
 }
 
 test(function serverTimeout(cb) {
-  const server = http.createServer(common.mustCall((req, res) => {
-    // just do nothing, we should get a timeout event.
-  }));
+  const server = http.createServer((req, res) => {
+    // Do nothing. We should get a timeout event.
+    // Might not be invoked. Do not wrap in common.mustCall().
+  });
   server.listen(common.mustCall(() => {
     const s = server.setTimeout(50, common.mustCall((socket) => {
       socket.destroy();
diff --git a/test/sequential/test-https-set-timeout-server.js b/test/parallel/test-https-set-timeout-server.js
similarity index 97%
rename from test/sequential/test-https-set-timeout-server.js
rename to test/parallel/test-https-set-timeout-server.js
index d2b44a0303da46..d3d6506fd70a98 100644
--- a/test/sequential/test-https-set-timeout-server.js
+++ b/test/parallel/test-https-set-timeout-server.js
@@ -36,9 +36,10 @@ function run() {
 test(function serverTimeout(cb) {
   const server = https.createServer(
     serverOptions,
-    common.mustCall((req, res) => {
-      // just do nothing, we should get a timeout event.
-    }));
+    (req, res) => {
+      // Do nothing. We should get a timeout event.
+      // Might not be invoked. Do not wrap in common.mustCall().
+    });
   server.listen(common.mustCall(() => {
     const s = server.setTimeout(50, common.mustCall((socket) => {
       socket.destroy();