1 files changed, 3 insertions, 0 deletions
diff --git a/scd/app-nks.c b/scd/app-nks.c
index 801ab904a..0f38e7cd0 100644
--- a/scd/app-nks.c
+++ b/scd/app-nks.c
@@ -1169,6 +1169,9 @@ do_change_pin (app_t app, ctrl_t ctrl,  const char *pwidstr,
   if (!newdesc)
     return gpg_error (GPG_ERR_INV_ID);
 
+  if ((flags & APP_CHANGE_FLAG_CLEAR))
+    return gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);
+
   err = switch_application (app, is_sigg);
   if (err)
     return err;