diff --git a/src/Blakechain.php b/src/Blakechain.php
index a90d182..be85a52 100644
--- a/src/Blakechain.php
+++ b/src/Blakechain.php
@@ -109,6 +109,7 @@ public function getSummaryHash(bool $rawBinary = false): string
         /* Make a XOR-encrypted copy of the hash state to prevent PHP's
          * interned strings from overwriting the hash state and causing
          * corruption. */
+        /** @psalm-suppress InternalMethod */
         $len = Util::strlen($this->summaryHashState);
         $pattern = \random_bytes($len);
         $tmp = $pattern ^ $this->summaryHashState;
@@ -204,6 +205,7 @@ public function setFirstPrevHash(string $first = ''): self
      */
     public function setSummaryHashState(string $hashState): self
     {
+        /** @psalm-suppress InternalMethod */
         $len = Util::strlen($hashState);
         if ($len !== 384 && $len !== 361) {
             throw new \RangeException(