diff --git a/lib/krb5/pkinit.c b/lib/krb5/pkinit.c
index 5d1e1899c..3003b78a2 100644
--- a/lib/krb5/pkinit.c
+++ b/lib/krb5/pkinit.c
@@ -1540,7 +1540,7 @@ krb5_get_init_creds_opt_set_pkinit(krb5_context context,
 				   krb5_principal principal,
 				   const char *user_id,
 				   const char *x509_anchors,
-				   const char **chain,
+				   char * const * chain,
 				   int flags,
 				   krb5_prompter_fct prompter,
 				   void *prompter_data,