diff --git a/docs/usage.rst b/docs/usage.rst
index 73f6503..2ac14dc 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -625,10 +625,10 @@ srcpkg
   Name of the APT source package.
 
 mirror
-  URL of the repository (defaults to http://deb.debian.org/debian/)
+  URL of the repository.
 
 suite
-  Name of the APT repository release (jessie, wheezy, etc, defaults to sid)
+  Name of the APT repository release (jessie, wheezy, etc)
 
 repo
   Name of the APT repository (main, contrib, etc, defaults to main)
diff --git a/nvchecker_source/apt.py b/nvchecker_source/apt.py
index b03bba9..64b2fae 100644
--- a/nvchecker_source/apt.py
+++ b/nvchecker_source/apt.py
@@ -24,8 +24,8 @@ async def get_url(url):
 async def get_version(name, conf, *, cache, **kwargs):
   srcpkg = conf.get('srcpkg')
   pkg = conf.get('pkg')
-  mirror = conf.get('mirror', "http://deb.debian.org/debian/")
-  suite = conf.get('suite', 'sid')
+  mirror = conf['mirror']
+  suite = conf['suite']
   repo = conf.get('repo', 'main')
   arch = conf.get('arch', 'amd64')
   strip_release = conf.get('strip_release', False)
diff --git a/tests/test_apt.py b/tests/test_apt.py
index f39c030..0dd5c1b 100644
--- a/tests/test_apt.py
+++ b/tests/test_apt.py
@@ -10,6 +10,8 @@ pytestmark = [pytest.mark.asyncio, pytest.mark.needs_net]
 async def test_apt(get_version):
     assert await get_version("sigrok-firmware-fx2lafw", {
         "source": "apt",
+        "mirror": "http://deb.debian.org/debian/",
+        "suite": "sid",
     }) == "0.1.7-1"
 
 @flaky(max_runs=10)
@@ -17,12 +19,16 @@ async def test_apt_source_pkg(get_version):
     assert await get_version("test", {
         "source": "apt",
         "source_pkg": "golang-github-dataence-porter2",
+        "mirror": "http://deb.debian.org/debian/",
+        "suite": "sid",
     }) == "0.0~git20150829.56e4718-2"
 
 @flaky(max_runs=10)
 async def test_apt_strip_release(get_version):
     assert await get_version("sigrok-firmware-fx2lafw", {
         "source": "apt",
+        "mirror": "http://deb.debian.org/debian/",
+        "suite": "sid",
         "strip_release": 1,
     }) == "0.1.7"