--- a/src/ssl/bio.cc
+++ b/src/ssl/bio.cc
@@ -76,7 +76,7 @@
         BIO_meth_set_create(SquidMethods, squid_bio_create);
         BIO_meth_set_destroy(SquidMethods, squid_bio_destroy);
     }
-    const BIO_METHOD *useMethod = SquidMethods;
+    BIO_METHOD *useMethod = SquidMethods;
 #else
     BIO_METHOD *useMethod = &SquidMethods;
 #endif