diff --git a/src/trezor/config.py b/src/trezor/config.py
index 8670bc7e..8eee4396 100644
--- a/src/trezor/config.py
+++ b/src/trezor/config.py
@@ -18,7 +18,7 @@ else: # emulator (mock implementation using binary file)
     import ustruct
 
     _mock = {}
-    _file = 'trezor.config'
+    _file = '/var/tmp/trezor.config'
 
     def _load():
         try: