diff --git a/src/Psalm/Internal/Cli/Psalm.php b/src/Psalm/Internal/Cli/Psalm.php
index 43b8afe5f81..98c16d5c23a 100644
--- a/src/Psalm/Internal/Cli/Psalm.php
+++ b/src/Psalm/Internal/Cli/Psalm.php
@@ -431,8 +431,8 @@ public static function getThreads(array $options, Config $config, bool $in_ci, b
         }
 
         if ($for_scan) {
-            if (isset($options['scanThreads'])) {
-                $threads = max(1, (int)$options['scanThreads']);
+            if (isset($options['scan-threads'])) {
+                $threads = max(1, (int)$options['scan-threads']);
             } elseif (isset($options['debug']) || $in_ci) {
                 $threads = 1;
             } elseif ($config->scan_threads) {