diff --git a/src/node_url.cc b/src/node_url.cc
index b13c94f030fa59..1faaf5d957844c 100644
--- a/src/node_url.cc
+++ b/src/node_url.cc
@@ -430,7 +430,6 @@ void URLHost::ParseIPv4Host(const char* input, size_t length, bool* is_ipv4) {
     pointer++;
   }
   CHECK_GT(parts, 0);
-  *is_ipv4 = true;
 
   // If any but the last item in numbers is greater than 255, return failure.
   // If the last item in numbers is greater than or equal to
@@ -441,6 +440,8 @@ void URLHost::ParseIPv4Host(const char* input, size_t length, bool* is_ipv4) {
     return;
   }
 
+  *is_ipv4 = true;
+
   type_ = HostType::H_IPV4;
   val = static_cast<uint32_t>(numbers[parts - 1]);
   for (int n = 0; n < parts - 1; n++) {
diff --git a/test/parallel/test-whatwg-url-constructor.js b/test/parallel/test-whatwg-url-constructor.js
index 3dc1c5986027e7..82972eddb5f8da 100644
--- a/test/parallel/test-whatwg-url-constructor.js
+++ b/test/parallel/test-whatwg-url-constructor.js
@@ -5,6 +5,7 @@ if (!common.hasIntl) {
   common.skip('missing Intl');
 }
 
+const assert = require('assert');
 const fixtures = require('../common/fixtures');
 const { test, assert_equals, assert_true, assert_throws } =
   require('../common/wpt').harness;
@@ -142,3 +143,5 @@ function runURLSearchParamTests() {
 runURLSearchParamTests()
 runURLConstructorTests()
 /* eslint-enable */
+
+assert.throws(() => new URL('https://256.256.256.256.256'), { code: 'ERR_INVALID_URL' });