diff --git a/g10/call-agent.c b/g10/call-agent.c
index eb9f8e29b..4defa7990 100644
--- a/g10/call-agent.c
+++ b/g10/call-agent.c
@@ -161,6 +161,7 @@ default_inq_cb (void *opaque, const char *line)
             || has_leading_keyword (line, "NEW_PASSPHRASE"))
            && opt.pinentry_mode == PINENTRY_MODE_LOOPBACK)
     {
+      assuan_begin_confidential (parm->ctx);
       if (have_static_passphrase ())
         {
           s = get_static_passphrase ();
@@ -187,6 +188,7 @@ default_inq_cb (void *opaque, const char *line)
             err = assuan_send_data (parm->ctx, pw, strlen (pw));
           xfree (pw);
         }
+      assuan_end_confidential (parm->ctx);
     }
   else if ((s = has_leading_keyword (line, "CONFIRM"))
            && opt.pinentry_mode == PINENTRY_MODE_LOOPBACK
diff --git a/sm/call-agent.c b/sm/call-agent.c
index 698039504..71768910f 100644
--- a/sm/call-agent.c
+++ b/sm/call-agent.c
@@ -221,7 +221,9 @@ default_inq_cb (void *opaque, const char *line)
            && have_static_passphrase ())
     {
       const char *s = get_static_passphrase ();
+      assuan_begin_confidential (parm->ctx);
       err = assuan_send_data (parm->ctx, s, strlen (s));
+      assuan_end_confidential (parm->ctx);
     }
   else
     log_error ("ignoring gpg-agent inquiry '%s'\n", line);