diff --git a/src/CryptKey.php b/src/CryptKey.php
index 3e1285f91..3a3bdd9d4 100644
--- a/src/CryptKey.php
+++ b/src/CryptKey.php
@@ -27,7 +27,6 @@
 use function openssl_pkey_get_private;
 use function openssl_pkey_get_public;
 use function sprintf;
-use function strpos;
 use function trigger_error;
 
 class CryptKey implements CryptKeyInterface