diff --git a/library/ssl_tls12_client.c b/library/ssl_tls12_client.c
index df7dfbf..ec778f9 100644
--- a/library/ssl_tls12_client.c
+++ b/library/ssl_tls12_client.c
@@ -869,7 +869,7 @@
                               const unsigned char *buf, size_t len)
 {
     size_t list_len, name_len;
-    const char **p;
+    const char *const *p;
 
     /* If we didn't send it, the server shouldn't send it */
     if (ssl->conf->alpn_list == NULL) {