diff --git a/cli/js/tests/url_test.ts b/cli/js/tests/url_test.ts
index e8348b206a..12e7cb26aa 100644
--- a/cli/js/tests/url_test.ts
+++ b/cli/js/tests/url_test.ts
@@ -219,11 +219,17 @@ unitTest(function throwForInvalidPortConstructor(): void {
     `https://baz.qat:${2 ** 16}`,
     "https://baz.qat:-32",
     "https://baz.qat:deno",
+    "https://baz.qat:9land",
+    "https://baz.qat:10.5",
   ];
 
   for (const url of urls) {
     assertThrows(() => new URL(url));
   }
+
+  // Do not throw for 0 & 65535
+  new URL("https://baz.qat:65535");
+  new URL("https://baz.qat:0");
 });
 
 unitTest(function doNotOverridePortIfInvalid(): void {
@@ -233,22 +239,8 @@ unitTest(function doNotOverridePortIfInvalid(): void {
     `${2 ** 16}`,
     "-32",
     "deno",
-  ];
-
-  for (const port of ports) {
-    const url = new URL(`https://deno.land:${initialPort}`);
-    url.port = port;
-    assertEquals(url.port, initialPort);
-  }
-});
-
-unitTest(function doNotOverridePortIfInvalid(): void {
-  const initialPort = "3000";
-  const ports = [
-    // If port is greater than 2^16 − 1, validation error, return failure.
-    `${2 ** 16}`,
-    "-32",
-    "deno",
+    "9land",
+    "10.5",
   ];
 
   for (const port of ports) {
diff --git a/cli/js/web/url.ts b/cli/js/web/url.ts
index 77285e456a..6a8dc66272 100644
--- a/cli/js/web/url.ts
+++ b/cli/js/web/url.ts
@@ -193,10 +193,10 @@ export class URLImpl implements URL {
     // https://url.spec.whatwg.org/#port-state
     if (value === "") return value;
 
-    const port = parseInt(value, 10);
-
-    if (!Number.isNaN(port) && port > 0 && port <= MAX_PORT)
+    const port = Number(value);
+    if (Number.isInteger(port) && port >= 0 && port <= MAX_PORT) {
       return port.toString();
+    }
 
     return undefined;
   };