diff --git a/tests/conftest.py b/tests/conftest.py
index 1763d01..bddf44a 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -43,7 +43,10 @@ async def get_version():
   async def __call__(name, config):
 
     if isinstance(config, dict):
-      _config = configparser.ConfigParser(dict_type=dict, allow_no_value=True)
+      _config = configparser.ConfigParser(
+        dict_type=dict, allow_no_value=True,
+        interpolation=None,
+      )
       _config.read_dict({name: config})
       config = _config[name]
 
diff --git a/tests/test_cmd.py b/tests/test_cmd.py
index 336f126..326f33d 100644
--- a/tests/test_cmd.py
+++ b/tests/test_cmd.py
@@ -1,6 +1,7 @@
 # MIT licensed
 # Copyright (c) 2013-2017 lilydjwg <lilydjwg@gmail.com>, et al.
 
+import time
 import pytest
 pytestmark = pytest.mark.asyncio
 
@@ -9,3 +10,12 @@ async def test_cmd(get_version):
 
 async def test_cmd_complex(get_version):
     assert await get_version("example", {"cmd": "echo Meow | sed 's/meow/woof/i'"}) == "woof"
+
+async def test_cmd_with_percent(run_source):
+    test_conf = '''\
+[example]
+cmd = date +%Y-%m-%d'''
+    date = await run_source(test_conf)
+    expected = time.strftime('%Y-%m-%d')
+    assert date == expected
+