diff --git a/trezor_agent/gpg/keyring.py b/trezor_agent/gpg/keyring.py
index d72ca3e..9440b0f 100644
--- a/trezor_agent/gpg/keyring.py
+++ b/trezor_agent/gpg/keyring.py
@@ -114,6 +114,11 @@ def sign_digest(sock, keygrip, digest):
 
     ttyname = subprocess.check_output('tty').strip()
     options = ['ttyname={}'.format(ttyname)]  # set TTY for passphrase entry
+
+    display = os.environ.get('DISPLAY')
+    if display is not None:
+        options.append('display={}'.format(display))
+
     for opt in options:
         assert _communicate(sock, 'OPTION {}'.format(opt)) == b'OK'