diff --git a/src/Utils/IdentitiesGenerator.php b/src/Utils/IdentitiesGenerator.php
index f81b54e..2d5f240 100644
--- a/src/Utils/IdentitiesGenerator.php
+++ b/src/Utils/IdentitiesGenerator.php
@@ -37,6 +37,6 @@ public static function generateIdentitiesCacheKey(string $identifier, ?object $t
     {
         $hashedTraits = $traits !== null ? '.'.sha1(serialize($traits)) : '';
         $hashedIdentifier = sha1($identifier);
-        return 'Identity.'.$transient ? 'Transient' : ''.$hashedIdentifier.$hashedTraits;
+        return 'Identity.'.($transient ? 'Transient' : '').$hashedIdentifier.$hashedTraits;
     }
 }
diff --git a/tests/Engine/Unit/Utils/IdentitiesGeneratorTest.php b/tests/Engine/Unit/Utils/IdentitiesGeneratorTest.php
new file mode 100644
index 0000000..a650fa3
--- /dev/null
+++ b/tests/Engine/Unit/Utils/IdentitiesGeneratorTest.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Engine\Unit\Utils;
+
+use Flagsmith\Utils\IdentitiesGenerator;
+use PHPUnit\Framework\TestCase;
+
+class IdentitiesGeneratorTest extends TestCase
+{
+    public function testGenerateIdentitiesCacheKey(): void
+    {
+        $identityId = 'test-identity-id';
+        $traits = (object) ['key' => 'value'];
+        $cacheKey = IdentitiesGenerator::generateIdentitiesCacheKey($identityId, $traits, null);
+
+        $this->assertStringContainsString('Identity.', $cacheKey);
+        $this->assertStringContainsString(sha1($identityId), $cacheKey);
+    }
+
+    public function testGenerateIdentitiesTransientCacheKey(): void
+    {
+        $identityId = 'test-identity-id';
+        $traits = (object) ['key' => 'value'];
+        $cacheKey = IdentitiesGenerator::generateIdentitiesCacheKey($identityId, $traits, true);
+
+        $this->assertStringContainsString('Identity.Transient', $cacheKey);
+        $this->assertStringContainsString(sha1($identityId), $cacheKey);
+    }
+}