diff --git a/libagent/device/ui.py b/libagent/device/ui.py
index 0536037..2dfb8ed 100644
--- a/libagent/device/ui.py
+++ b/libagent/device/ui.py
@@ -6,7 +6,7 @@ import subprocess
 
 try:
     from trezorlib.client import PASSPHRASE_ON_DEVICE
-except Exception:
+except ImportError:
     PASSPHRASE_ON_DEVICE = object()
 
 from .. import util