diff --git a/cli/tests/unit/url_test.ts b/cli/tests/unit/url_test.ts
index 644b8dd39a..28cf9a0e2c 100644
--- a/cli/tests/unit/url_test.ts
+++ b/cli/tests/unit/url_test.ts
@@ -32,6 +32,21 @@ Deno.test(function urlParsing() {
   );
 });
 
+Deno.test(function emptyUrl() {
+  assertThrows(
+    // @ts-ignore for test
+    () => new URL(),
+    TypeError,
+    "1 argument required, but only 0 present",
+  );
+  assertThrows(
+    // @ts-ignore for test
+    () => URL.canParse(),
+    TypeError,
+    "1 argument required, but only 0 present",
+  );
+});
+
 Deno.test(function urlProtocolParsing() {
   assertEquals(new URL("Aa+-.1://foo").protocol, "aa+-.1:");
   assertEquals(new URL("aA+-.1://foo").protocol, "aa+-.1:");
diff --git a/ext/url/00_url.js b/ext/url/00_url.js
index d76366cfae..7f674e9aa2 100644
--- a/ext/url/00_url.js
+++ b/ext/url/00_url.js
@@ -371,6 +371,7 @@ class URL {
    */
   constructor(url, base = undefined) {
     const prefix = "Failed to construct 'URL'";
+    webidl.requiredArguments(arguments.length, 1, prefix);
     url = webidl.converters.DOMString(url, { prefix, context: "Argument 1" });
     if (base !== undefined) {
       base = webidl.converters.DOMString(base, {
@@ -390,6 +391,7 @@ class URL {
    */
   static canParse(url, base = undefined) {
     const prefix = "Failed to call 'URL.canParse'";
+    webidl.requiredArguments(arguments.length, 1, prefix);
     url = webidl.converters.DOMString(url, { prefix, context: "Argument 1" });
     if (base !== undefined) {
       base = webidl.converters.DOMString(base, {