diff --git a/src/Command/AnalyserRunner.php b/src/Command/AnalyserRunner.php
index 633b11e3441..9a2d3f1281a 100644
--- a/src/Command/AnalyserRunner.php
+++ b/src/Command/AnalyserRunner.php
@@ -60,7 +60,7 @@ public function runAnalyser(
 			!$debug
 			&& $allowParallel
 			&& $mainScript !== null
-			&& $schedule->getNumberOfProcesses() > 0
+			&& $schedule->getNumberOfProcesses() > 1
 		) {
 			return $this->parallelAnalyser->analyse($schedule, $mainScript, $postFileCallback, $projectConfigFile, $tmpFile, $insteadOfFile, $input);
 		}