diff --git a/public/bash-interactive-init.sh b/public/bash-interactive-init.sh
index 3b9f2e6..aad7d75 100644
--- a/public/bash-interactive-init.sh
+++ b/public/bash-interactive-init.sh
@@ -16,3 +16,8 @@ case "$TERM" in
     xterm) TERM=xterm-256color;;
     screen) TERM=screen-256color;;
 esac
+
+# info gnupg, invocate gpg agent
+GPG_TTY=$(tty)
+export GPG_TTY
+