diff --git a/__tests__/KeyValues3.save.txt b/__tests__/KeyValues3.save.txt
index 5918eac..cdc4d9d 100644
--- a/__tests__/KeyValues3.save.txt
+++ b/__tests__/KeyValues3.save.txt
@@ -135,4 +135,8 @@ Second line of a multi-line string literal.
         r1 = deferred_resource:""
         r2 = resource:""
     }
+    "1" =
+    {
+        a = 1
+    }
 }
\ No newline at end of file
diff --git a/__tests__/KeyValues3.test.ts b/__tests__/KeyValues3.test.ts
index 571fae9..922052e 100644
--- a/__tests__/KeyValues3.test.ts
+++ b/__tests__/KeyValues3.test.ts
@@ -1,8 +1,8 @@
+import { describe, expect, test } from '@jest/globals';
+import crypto from 'crypto';
 import { join } from 'path';
 import { KV3BaseValue } from '../src/KeyValues3';
 import { KeyValues3, getKeyValuesAdapter } from '../src/node';
-import { describe, expect, test } from '@jest/globals';
-import crypto from 'crypto';
 
 describe('KeyValues3', () => {
     test('Check KeyValues3 Methods', () => {
@@ -303,12 +303,19 @@ Second line of a multi-line string literal.
         }
 
         const obj = root.FindKey('objectValue')?.GetValue();
+        expect(obj?.IsObject()).toBe(true);
         if (obj?.IsObject()) {
             expect(obj.FindKey('n')?.GetValue().Value()).toBe(5);
             expect(obj.FindKey('s')?.GetValue().Value()).toBe('foo');
             expect(obj.FindKey('h')?.GetValue().IsArray()).toBe(true);
         }
 
+        const obj1 = root.FindKey('1')?.GetValue();
+        expect(obj1?.IsObject()).toBe(true);
+        if (obj1?.IsObject()) {
+            expect(obj1.FindKey('a')?.GetValue().Value()).toBe(1);
+        }
+
         expect(
             root
                 .FindKey('objectValue')
diff --git a/__tests__/KeyValues3.txt b/__tests__/KeyValues3.txt
index 50eb10c..dc1db59 100644
--- a/__tests__/KeyValues3.txt
+++ b/__tests__/KeyValues3.txt
@@ -87,5 +87,9 @@ Second line of a multi-line string literal.
         m = .2-1
         r1 = deferred_resource:""
         r2 = resource:""
-	}
+	},
+    "1" =
+    {
+        a = 1
+    }
 }
\ No newline at end of file
diff --git a/__tests__/__snapshots__/KeyValues3.test.ts.snap b/__tests__/__snapshots__/KeyValues3.test.ts.snap
index 8c2c33e..68e0c70 100644
--- a/__tests__/__snapshots__/KeyValues3.test.ts.snap
+++ b/__tests__/__snapshots__/KeyValues3.test.ts.snap
@@ -197,5 +197,9 @@ Second line of a multi-line string literal.
         r1 = deferred_resource:""
         r2 = resource:""
     }
+    "1" =
+    {
+        a = 1
+    }
 }"
 `;
diff --git a/package.json b/package.json
index 874622f..469bda5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "easy-keyvalues",
-    "version": "1.2.4",
+    "version": "1.2.5",
     "description": "Parse Valve KeyValues Format and easy to use in nodejs or browser.",
     "main": "dist/node.js",
     "engines": {
diff --git a/src/KeyValues3.ts b/src/KeyValues3.ts
index 629e7a8..3c30d90 100644
--- a/src/KeyValues3.ts
+++ b/src/KeyValues3.ts
@@ -662,7 +662,8 @@ class ValueFeatureObject extends ValueObject {
     }
 }
 
-const MatchKeyNoQuote = /^[\w\d_\.]+$/;
+const MatchKeyNoQuote = /^[0-9a-zA-Z_\.]+$/;
+const MatchKeyNumber = /^\d+$/;
 const MatchInt = /^-?\d+$/;
 const MatchDouble = /^-?\d+(\.\d+)?$/;
 const MatchDouble2 = /^-?\.\d+$/;
@@ -850,7 +851,7 @@ export default class KeyValues3 {
         let prefix = '';
         const root = this.IsRoot();
 
-        if (MatchKeyNoQuote.test(this.Key)) {
+        if (MatchKeyNoQuote.test(this.Key) && !MatchKeyNumber.test(this.Key)) {
             prefix = `${tab}${this.Key} =`;
         } else {
             prefix = `${tab}"${this.Key}" =`;