diff --git a/afpre b/afpre
index 6a4c2c0..445cbad 100755
--- a/afpre
+++ b/afpre
@@ -203,6 +203,8 @@ condrenew() {
 
 PROMPT_COMMAND=condrenew
 
+export -f renew basic_auth error_msg json_value secs_since_epoch on_mac
+
 PS1="AFP|${PATTERN} \$PS1"
 
 $CMD_AND_EXIT