diff --git a/psalm.xml b/psalm.xml
index 597e73c60..9e239f125 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -14,6 +14,7 @@
     </issueHandlers>
     <projectFiles>
         <directory name="src" />
+        <directory name="tests" />
         <ignoreFiles>
             <directory name="vendor" />
         </ignoreFiles>