diff --git a/lib/internal/validators.js b/lib/internal/validators.js
index 110b045a063460..56b26d6292261d 100644
--- a/lib/internal/validators.js
+++ b/lib/internal/validators.js
@@ -428,7 +428,7 @@ const validatePort = hideStackFrames((port, name = 'Port', allowZero = true) =>
       (typeof port === 'string' && StringPrototypeTrim(port).length === 0) ||
       +port !== (+port >>> 0) ||
       port > 0xFFFF ||
-      (port === 0 && !allowZero)) {
+      (+port === 0 && !allowZero)) {
     throw new ERR_SOCKET_BAD_PORT(name, port, allowZero);
   }
   return port | 0;
diff --git a/test/parallel/test-dgram-connect.js b/test/parallel/test-dgram-connect.js
index 30e817f344a42c..8d2d78652366af 100644
--- a/test/parallel/test-dgram-connect.js
+++ b/test/parallel/test-dgram-connect.js
@@ -55,7 +55,7 @@ assert.throws(() => {
   code: 'ERR_SOCKET_DGRAM_NOT_CONNECTED'
 });
 
-[ 0, null, 78960, undefined ].forEach((port) => {
+[ 0, '0', null, 78960, undefined ].forEach((port) => {
   assert.throws(() => {
     client.connect(port);
   }, {
diff --git a/test/parallel/test-internal-validators-validateport.js b/test/parallel/test-internal-validators-validateport.js
index a4c92b8dbca929..aad6ac926e71df 100644
--- a/test/parallel/test-internal-validators-validateport.js
+++ b/test/parallel/test-internal-validators-validateport.js
@@ -21,3 +21,10 @@ for (let n = 0; n <= 0xFFFF; n++) {
 ].forEach((i) => assert.throws(() => validatePort(i), {
   code: 'ERR_SOCKET_BAD_PORT'
 }));
+
+// When `allowZero` is false, both the number `0` and the string `'0'` (and
+// other numeric-zero string forms) must be rejected.
+[0, '0', '0x0', '0o0', '0b0'].forEach((i) => assert.throws(
+  () => validatePort(i, 'Port', false),
+  { code: 'ERR_SOCKET_BAD_PORT' },
+));