diff --git a/tests/dogtail/addtrans.py b/tests/dogtail/addtrans.py
index 34f14d7..f92620f 100644
--- a/tests/dogtail/addtrans.py
+++ b/tests/dogtail/addtrans.py
@@ -2,10 +2,9 @@
 # Dogtail test script for addtrans.
 
 import os
+import shlex
 import tempfile
 
-from shlex import quote
-
 from dogtail import config
 from dogtail import tree
 from dogtail.procedural import type
@@ -34,11 +33,11 @@
 2015-10-05 * beer
     Assets:Cash                       -30 CHF
     Expenses:Drinking                  30 CHF
-""")
+""".encode())
 t.flush()
 t.seek(0, 0)
 
-run('addtrans --file %s' % quote(t.name))
+run(shlex.join(['addtrans', '--file', t.name]))
 addtrans = tree.root.application('addtrans')
 mainwin = addtrans.window('Add transaction')