diff --git a/downloads/tests/base.py b/downloads/tests/base.py
index e19ffe03a..bcb7905c4 100644
--- a/downloads/tests/base.py
+++ b/downloads/tests/base.py
@@ -64,6 +64,7 @@ def setUp(self):
             is_source=True,
             description='Gzipped source',
             url='ftp/python/2.7.5/Python-2.7.5.tgz',
+            filesize=12345678,
         )
 
         self.draft_release = Release.objects.create(
diff --git a/downloads/tests/test_views.py b/downloads/tests/test_views.py
index 75fe76693..50270c556 100644
--- a/downloads/tests/test_views.py
+++ b/downloads/tests/test_views.py
@@ -40,6 +40,9 @@ def test_download_release_detail(self):
         response = self.client.get(url)
         self.assertEqual(response.status_code, 200)
 
+        with self.subTest("Release file sizes should be human-readable"):
+            self.assertInHTML("<td>11.8 MB</td>", response.content.decode())
+
         url = reverse('download:download_release_detail', kwargs={'release_slug': 'fake_slug'})
         response = self.client.get(url)
         self.assertEqual(response.status_code, 404)
diff --git a/templates/downloads/release_detail.html b/templates/downloads/release_detail.html
index b68b69a66..c8b18de45 100644
--- a/templates/downloads/release_detail.html
+++ b/templates/downloads/release_detail.html
@@ -62,7 +62,7 @@ <h1 class="page-title">Files</h1>
                 <td>{{ f.os.name }}</td>
                 <td>{{ f.description }}</td>
                 <td>{{ f.md5_sum }}</td>
-                <td>{{ f.filesize }}</td>
+                <td>{{ f.filesize|filesizeformat }}</td>
                 <td>{% if f.gpg_signature_file %}<a href="{{ f.gpg_signature_file }}">SIG</a>{% endif %}</td>
                 {% if release_files|has_sigstore_materials %}
                   {% if f.sigstore_bundle_file %}