diff --git a/system/Session/Session.php b/system/Session/Session.php
index 0b27b03fa46e..99236e7efd7b 100644
--- a/system/Session/Session.php
+++ b/system/Session/Session.php
@@ -188,6 +188,7 @@ public function __construct(SessionHandlerInterface $driver, App $config)
         $cookie = config('Cookie');
 
         $this->cookie = new Cookie($this->sessionCookieName, '', [
+            'prefix'   => $cookie->prefix ?? $config->cookiePrefix,
             'expires'  => $this->sessionExpiration === 0 ? 0 : time() + $this->sessionExpiration,
             'path'     => $cookie->path ?? $config->cookiePath,
             'domain'   => $cookie->domain ?? $config->cookieDomain,
@@ -289,7 +290,7 @@ protected function configure()
         if (empty($this->sessionCookieName)) {
             $this->sessionCookieName = ini_get('session.name');
         } else {
-            ini_set('session.name', $this->sessionCookieName);
+            ini_set('session.name', $this->cookie->getPrefixedName());
         }
 
         $sameSite = $this->cookie->getSameSite() ?: ucfirst(Cookie::SAMESITE_LAX);
diff --git a/tests/system/Session/SessionTest.php b/tests/system/Session/SessionTest.php
index 574ffaf99ce9..c638e98822b1 100644
--- a/tests/system/Session/SessionTest.php
+++ b/tests/system/Session/SessionTest.php
@@ -644,4 +644,22 @@ public function testExpiresOnClose()
         $this->assertCount(1, $cookies);
         $this->assertSame(0, $cookies[0]->getExpiresTimestamp());
     }
+
+    public function testCookieCreatedHasNameWithPrefix()
+    {
+        $config         = new CookieConfig();
+        $config->prefix = 'test_';
+        Factories::injectMock('config', CookieConfig::class, $config);
+
+        $session = $this->getInstance(['sessionCookieName' => 'ci_session']);
+
+        $session->start();
+
+        $cookies = $session->cookies;
+        $this->assertCount(1, $cookies);
+        $this->assertSame('test_', $cookies[0]->getPrefix());
+        $this->assertSame('ci_session', $cookies[0]->getName());
+        $this->assertSame('test_ci_session', $cookies[0]->getPrefixedName());
+        $this->assertSame('test_ci_session', ini_get('session.name'));
+    }
 }