diff --git a/test/test_convert.py b/test/test_convert.py
index 16f2f4799..675c4be95 100644
--- a/test/test_convert.py
+++ b/test/test_convert.py
@@ -24,6 +24,7 @@ from test.helper import control_stdin
 
 from beets.mediafile import MediaFile
 from beets import util
+from beets import ui
 
 
 class TestHelper(helper.TestHelper):
@@ -107,7 +108,11 @@ class ConvertCommand(object):
     """
     def run_convert_path(self, path, *args):
         """Run the `convert` command on a given path."""
-        args = args + ('path:' + path,)
+        # The path is currently a filesystem bytestring. Convert it to
+        # an argument bytestring.
+        path = path.decode(util._fsencoding()).encode(ui._arg_encoding())
+
+        args = args + (b'path:' + path,)
         return self.run_command('convert', *args)
 
     def run_convert(self, *args):