diff --git a/src/Framework/TestRunner.php b/src/Framework/TestRunner.php
index b1dd04a7004..c902cd2262c 100644
--- a/src/Framework/TestRunner.php
+++ b/src/Framework/TestRunner.php
@@ -251,7 +251,7 @@ public function run(TestCase $test): void
      */
     public function runInSeparateProcess(TestCase $test, bool $runEntireClass, bool $preserveGlobalState): void
     {
-        if ($runEntireClass && $this->isPcntlForkAvailable()) {
+        if ($this->isPcntlForkAvailable()) {
             // forking the parent process is a more lightweight way to run a test in isolation.
             // it requires the pcntl extension though.
             $this->runInFork($test);