diff --git a/fimfarchive/utils.py b/fimfarchive/utils.py
index 6f92d6c..0095b91 100644
--- a/fimfarchive/utils.py
+++ b/fimfarchive/utils.py
@@ -246,8 +246,8 @@ def is_blacklisted(story: Story) -> bool:
     Returns:
         True if a story has been blacklisted.
     """
-    story_id = story.key
-    author_id = story.meta['author']['id']
+    story_id = int(story.meta['id'])
+    author_id = int(story.meta['author']['id'])
 
     if story_id in STORY_WHITELIST:
         return False
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 3be0b5c..e571aa9 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -37,13 +37,6 @@ from fimfarchive.utils import (
 )
 
 
-BLACKLISTED_AUTHOR = 1
-BLACKLISTED_STORY = 2
-WHITELISTED_STORY = 3
-UNLISTED_AUTHOR = 4
-UNLISTED_STORY = 5
-
-
 class TestEmpty:
     """
     Empty tests.
@@ -327,27 +320,34 @@ class TestIsBlacklisted:
     """
     is_blacklisted tests.
     """
+    BLACKLISTED_AUTHOR = 1
+    BLACKLISTED_STORY = 2
+    WHITELISTED_STORY = 3
+    UNLISTED_AUTHOR = 4
+    UNLISTED_STORY = 5
 
-    @pytest.fixture
-    def utils(self):
-        """
-        Patches the blacklists and whitelists.
-        """
-        ab = patch.object(utils, 'AUTHOR_BLACKLIST', {BLACKLISTED_AUTHOR})
-        sb = patch.object(utils, 'STORY_BLACKLIST', {BLACKLISTED_STORY})
-        sw = patch.object(utils, 'STORY_WHITELIST', {WHITELISTED_STORY})
-
-        with ab, sb, sw:
-            yield utils
-
-    @pytest.mark.parametrize('key,author,result', [
+    COMBINATIONS = [
         (BLACKLISTED_STORY, BLACKLISTED_AUTHOR, True),
         (BLACKLISTED_STORY, UNLISTED_AUTHOR, True),
         (UNLISTED_STORY, BLACKLISTED_AUTHOR, True),
         (UNLISTED_STORY, UNLISTED_AUTHOR, False),
         (WHITELISTED_STORY, BLACKLISTED_AUTHOR, False),
         (WHITELISTED_STORY, UNLISTED_AUTHOR, False),
-    ])
+    ]
+
+    @pytest.fixture
+    def utils(self):
+        """
+        Patches the blacklists and whitelists.
+        """
+        ab = patch.object(utils, 'AUTHOR_BLACKLIST', {self.BLACKLISTED_AUTHOR})
+        sb = patch.object(utils, 'STORY_BLACKLIST', {self.BLACKLISTED_STORY})
+        sw = patch.object(utils, 'STORY_WHITELIST', {self.WHITELISTED_STORY})
+
+        with ab, sb, sw:
+            yield utils
+
+    @pytest.mark.parametrize('key,author,result', COMBINATIONS)
     def test_blacklisted(self, utils, story, key, author, result):
         """
         Tests the various blacklist combinations.
@@ -356,3 +356,13 @@ class TestIsBlacklisted:
         story = story.merge(key=key, meta=meta)
 
         assert result is is_blacklisted(story)
+
+    @pytest.mark.parametrize('key,author,result', COMBINATIONS)
+    def test_blacklisted_string(self, utils, story, key, author, result):
+        """
+        Tests the various blacklist combinations when IDs are strings.
+        """
+        meta = {'id': str(key), 'author': {'id': str(author)}}
+        story = story.merge(key=key, meta=meta)
+
+        assert result is is_blacklisted(story)