diff --git a/g10/tofu.c b/g10/tofu.c
index 169e29efd..9f83fa404 100644
--- a/g10/tofu.c
+++ b/g10/tofu.c
@@ -1573,7 +1573,7 @@ ask_about_binding (ctrl_t ctrl,
   struct signature_stats *stats = NULL;
   struct signature_stats *stats_iter = NULL;
   char *prompt = NULL;
-  char *choices;
+  const char *choices;
 
   dbs = ctrl->tofu.dbs;
   log_assert (dbs);