diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5b09072..d7a821d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,7 +33,8 @@ jobs:
       - name: Run phpunit tests
         run: |
           mkdir -p build/logs
-          vendor/bin/phpunit --coverage-clover ./build/logs/clover.xml
+          PROCESS_FACTORY=host vendor/bin/phpunit
+          PROCESS_FACTORY=docker vendor/bin/phpunit --coverage-clover ./build/logs/clover.xml
       - name: Run phpcs
         run: composer cs
 
diff --git a/phpunit.xml b/phpunit.xml
index dbf5daa..eac0d7d 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -10,6 +10,6 @@
     <exclude>./test/solutions</exclude>
   </testsuite>
   <php>
-    <env name="process_factory" value="docker" force="true" />
+    <env name="PROCESS_FACTORY" value="docker" />
   </php>
 </phpunit>
diff --git a/test/Exercise/ThrowAnExpressionTest.php b/test/Exercise/ThrowAnExpressionTest.php
index efbd979..161748d 100644
--- a/test/Exercise/ThrowAnExpressionTest.php
+++ b/test/Exercise/ThrowAnExpressionTest.php
@@ -34,7 +34,7 @@ public function testThrowingWrongException(): void
         self::assertInstanceOf(Success::class, $output->getResults()[1]);
 
         self::assertMatchesRegularExpression(
-            '/Fatal error: Uncaught Exception: Access denied!/',
+            '/Fatal error:\s+Uncaught Exception: Access denied!/',
             $output->getResults()[0]->getReason()
         );