diff --git a/src/Cryptor/Asymmetric/ElGamal/PrivateKey.php b/src/Cryptor/Asymmetric/ElGamal/PrivateKey.php
index ba8283bb..f8bd49f2 100644
--- a/src/Cryptor/Asymmetric/ElGamal/PrivateKey.php
+++ b/src/Cryptor/Asymmetric/ElGamal/PrivateKey.php
@@ -68,7 +68,7 @@ public function getPublicKey(): PublicKey
      */
     public function decrypt(string $cipherText): string
     {
-        $byteLength = Helper::bit2ByteLength($this->getBitSize()) * 2;
+        $inputSize = Helper::bit2ByteLength($this->getBitSize()) * 2;
         $length = strlen($cipherText);
         if ($length > $inputSize) {
             throw new \InvalidArgumentException(