diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1dae8dd..11984ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+## [4.0.4](https://github.com/socketio/socket.io-parser/compare/4.0.3...4.0.4) (2021-01-15)
+
+
+### Bug Fixes
+
+* allow integers as event names ([1c220dd](https://github.com/socketio/socket.io-parser/commit/1c220ddbf45ea4b44bc8dbf6f9ae245f672ba1b9))
+
+
 ## [4.0.3](https://github.com/socketio/socket.io-parser/compare/4.0.2...4.0.3) (2021-01-05)
 
 
diff --git a/lib/index.ts b/lib/index.ts
index 587dd54..636df23 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -245,7 +245,7 @@ export class Decoder extends Emitter {
         return typeof payload === "string" || typeof payload === "object";
       case PacketType.EVENT:
       case PacketType.BINARY_EVENT:
-        return Array.isArray(payload) && typeof payload[0] === "string";
+        return Array.isArray(payload) && payload.length > 0;
       case PacketType.ACK:
       case PacketType.BINARY_ACK:
         return Array.isArray(payload);
diff --git a/package-lock.json b/package-lock.json
index 3a2f1ce..fa41f9d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "socket.io-parser",
-  "version": "4.0.3",
+  "version": "4.0.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 646bf45..f15f403 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "socket.io-parser",
-  "version": "4.0.3",
+  "version": "4.0.4",
   "description": "socket.io protocol parser",
   "repository": {
     "type": "git",
diff --git a/test/parser.js b/test/parser.js
index 0554d93..426e77c 100644
--- a/test/parser.js
+++ b/test/parser.js
@@ -47,6 +47,17 @@ describe("parser", () => {
     );
   });
 
+  it("encodes an event (with an integer as event name)", (done) => {
+    helpers.test(
+      {
+        type: PacketType.EVENT,
+        data: [1, "a", {}],
+        nsp: "/",
+      },
+      done
+    );
+  });
+
   it("encodes an event (with ack)", (done) => {
     helpers.test(
       {