diff --git a/psalm.xml b/psalm.xml
index ba09c70..cf39fd1 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -24,5 +24,12 @@
             </errorLevel>
         </PossiblyInvalidArgument>
 
+        <RiskyTruthyFalsyComparison>
+            <errorLevel type="suppress">
+                <file name="src/CsrfMiddleware.php" />
+                <file name="src/MaskedCsrfToken.php" />
+            </errorLevel>
+        </RiskyTruthyFalsyComparison>
+
     </issueHandlers>
 </psalm>
\ No newline at end of file
diff --git a/src/SecurityHelper.php b/src/SecurityHelper.php
index b3ae6b5..c5f82e8 100644
--- a/src/SecurityHelper.php
+++ b/src/SecurityHelper.php
@@ -30,6 +30,7 @@ public function generateToken(int $length = 32): string
      */
     public function addMask(string $token): string
     {
+        /** @psalm-suppress InvalidArgument $mask */
         $mask = random_bytes(strlen($token));
 
         $token = $mask ^ $token;