diff --git a/tests/php-unit-tests/unitary-tests/core/dictTest.php b/tests/php-unit-tests/unitary-tests/core/dictTest.php
index 05b7360d5..2209d28b9 100644
--- a/tests/php-unit-tests/unitary-tests/core/dictTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/dictTest.php
@@ -97,6 +97,9 @@ PHP;
 
 	public function testInitLangIfNeeded_NoApc()
 	{
+		// Reset the dictionary
+		static::SetNonPublicStaticProperty('Dict', 'm_aData', []);
+
 		$oApcService = $this->createMock(\ApcService::class);
 		Dict::SetApcService($oApcService);
 		Dict::EnableCache('toto');